1644312601 has 2 divisors, whose sum is σ = 1644312602. Its totient is φ = 1644312600.

The previous prime is 1644312599. The next prime is 1644312613. The reversal of 1644312601 is 1062134461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 967272201 + 677040400 = 31101^2 + 26020^2 .

It is a cyclic number.

It is not a de Polignac number, because 1644312601 - 2¹ = 1644312599 is a prime.

It is a super-3 number, since 3×1644312601³ (a number of 29 digits) contains 333 as substring.

Together with 1644312599, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1644312601.

It is not a weakly prime, because it can be changed into another prime (1644312101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822156300 + 822156301.

It is an arithmetic number, because the mean of its divisors is an integer number (822156301).

Almost surely, 2^1644312601 is an apocalyptic number.

It is an amenable number.

1644312601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1644312601 is an equidigital number, since it uses as much as digits as its factorization.

1644312601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1644312601 is about 40550.1245497471. The cubic root of 1644312601 is about 1180.3064896194.

The spelling of 1644312601 in words is "one billion, six hundred forty-four million, three hundred twelve thousand, six hundred one".