87505515431 has 2 divisors, whose sum is σ = 87505515432. Its totient is φ = 87505515430.

The previous prime is 87505515407. The next prime is 87505515457. The reversal of 87505515431 is 13451550578.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87505515431 - 2¹⁰ = 87505514407 is a prime.

It is a super-2 number, since 2×87505515431² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87505515731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43752757715 + 43752757716.

It is an arithmetic number, because the mean of its divisors is an integer number (43752757716).

Almost surely, 2^87505515431 is an apocalyptic number.

87505515431 is a deficient number, since it is larger than the sum of its proper divisors (1).

87505515431 is an equidigital number, since it uses as much as digits as its factorization.

87505515431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 420000, while the sum is 44.

The spelling of 87505515431 in words is "eighty-seven billion, five hundred five million, five hundred fifteen thousand, four hundred thirty-one".