87539640431 has 2 divisors, whose sum is σ = 87539640432. Its totient is φ = 87539640430.

The previous prime is 87539640373. The next prime is 87539640451. The reversal of 87539640431 is 13404693578.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87539640431 is a prime.

It is a super-2 number, since 2×87539640431² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 87539640431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87539640451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43769820215 + 43769820216.

It is an arithmetic number, because the mean of its divisors is an integer number (43769820216).

Almost surely, 2^87539640431 is an apocalyptic number.

87539640431 is a deficient number, since it is larger than the sum of its proper divisors (1).

87539640431 is an equidigital number, since it uses as much as digits as its factorization.

87539640431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2177280, while the sum is 50.

The spelling of 87539640431 in words is "eighty-seven billion, five hundred thirty-nine million, six hundred forty thousand, four hundred thirty-one".