87034631581 has 2 divisors, whose sum is σ = 87034631582. Its totient is φ = 87034631580.

The previous prime is 87034631561. The next prime is 87034631599. The reversal of 87034631581 is 18513643078.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87019100100 + 15531481 = 294990^2 + 3941^2 .

It is a cyclic number.

It is not a de Polignac number, because 87034631581 - 2⁵ = 87034631549 is a prime.

It is a super-2 number, since 2×87034631581² (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 (87034631561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43517315790 + 43517315791.

It is an arithmetic number, because the mean of its divisors is an integer number (43517315791).

Almost surely, 2^87034631581 is an apocalyptic number.

It is an amenable number.

87034631581 is a deficient number, since it is larger than the sum of its proper divisors (1).

87034631581 is an equidigital number, since it uses as much as digits as its factorization.

87034631581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 483840, while the sum is 46.

The spelling of 87034631581 in words is "eighty-seven billion, thirty-four million, six hundred thirty-one thousand, five hundred eighty-one".