87156240931 has 2 divisors, whose sum is σ = 87156240932. Its totient is φ = 87156240930.

The previous prime is 87156240911. The next prime is 87156240937. The reversal of 87156240931 is 13904265178.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87156240931 - 2¹⁵ = 87156208163 is a prime.

It is a super-2 number, since 2×87156240931² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (87156240937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43578120465 + 43578120466.

It is an arithmetic number, because the mean of its divisors is an integer number (43578120466).

It is a 1-persistent number, because it is pandigital, but 2⋅87156240931 = 174312481862 is not.

Almost surely, 2^87156240931 is an apocalyptic number.

87156240931 is a deficient number, since it is larger than the sum of its proper divisors (1).

87156240931 is an equidigital number, since it uses as much as digits as its factorization.

87156240931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 87156240931 in words is "eighty-seven billion, one hundred fifty-six million, two hundred forty thousand, nine hundred thirty-one".