87372856913 has 2 divisors, whose sum is σ = 87372856914. Its totient is φ = 87372856912.

The previous prime is 87372856871. The next prime is 87372856927. The reversal of 87372856913 is 31965827378.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76469947024 + 10902909889 = 276532^2 + 104417^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87372856913 is a prime.

It is a super-2 number, since 2×87372856913² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (87372856013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43686428456 + 43686428457.

It is an arithmetic number, because the mean of its divisors is an integer number (43686428457).

Almost surely, 2^87372856913 is an apocalyptic number.

It is an amenable number.

87372856913 is a deficient number, since it is larger than the sum of its proper divisors (1).

87372856913 is an equidigital number, since it uses as much as digits as its factorization.

87372856913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15240960, while the sum is 59.

The spelling of 87372856913 in words is "eighty-seven billion, three hundred seventy-two million, eight hundred fifty-six thousand, nine hundred thirteen".