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1644140293 is a prime number
BaseRepresentation
bin110000111111111…
…1001011100000101
311020120201222110221
41201333321130011
511331344442133
6431051344341
755512650635
oct14177713405
94216658427
101644140293
1177408aa34
1239a7520b1
1320281bca3
141185046c5
159951ca2d
hex61ff9705

1644140293 has 2 divisors, whose sum is σ = 1644140294. Its totient is φ = 1644140292.

The previous prime is 1644140291. The next prime is 1644140353. The reversal of 1644140293 is 3920414461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1376261604 + 267878689 = 37098^2 + 16367^2 .

It is an emirp because it is prime and its reverse (3920414461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1644140293 - 21 = 1644140291 is a prime.

It is a super-3 number, since 3×16441402933 (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 1644140291, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1644140291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822070146 + 822070147.

It is an arithmetic number, because the mean of its divisors is an integer number (822070147).

Almost surely, 21644140293 is an apocalyptic number.

It is an amenable number.

1644140293 is a deficient number, since it is larger than the sum of its proper divisors (1).

1644140293 is an equidigital number, since it uses as much as digits as its factorization.

1644140293 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 1644140293 is about 40547.9998643583. Note that the first 3 decimals coincide. The cubic root of 1644140293 is about 1180.2652599581.

The spelling of 1644140293 in words is "one billion, six hundred forty-four million, one hundred forty thousand, two hundred ninety-three".