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140087581 is a prime number
BaseRepresentation
bin10000101100110…
…01000100011101
3100202121012000221
420112121010131
5241330300311
621522321341
73320503414
oct1026310435
9322535027
10140087581
1172091967
123aab9251
132303b17a
141486847b
15c472671
hex859911d

140087581 has 2 divisors, whose sum is σ = 140087582. Its totient is φ = 140087580.

The previous prime is 140087573. The next prime is 140087617. The reversal of 140087581 is 185780041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126765081 + 13322500 = 11259^2 + 3650^2 .

It is an emirp because it is prime and its reverse (185780041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 140087581 - 23 = 140087573 is a prime.

It is a super-2 number, since 2×1400875812 = 39249060700863122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140087501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70043790 + 70043791.

It is an arithmetic number, because the mean of its divisors is an integer number (70043791).

Almost surely, 2140087581 is an apocalyptic number.

It is an amenable number.

140087581 is a deficient number, since it is larger than the sum of its proper divisors (1).

140087581 is an equidigital number, since it uses as much as digits as its factorization.

140087581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8960, while the sum is 34.

The square root of 140087581 is about 11835.8599603071. The cubic root of 140087581 is about 519.3576647158.

The spelling of 140087581 in words is "one hundred forty million, eighty-seven thousand, five hundred eighty-one".