87037911581 has 2 divisors, whose sum is σ = 87037911582. Its totient is φ = 87037911580.

The previous prime is 87037911553. The next prime is 87037911589. The reversal of 87037911581 is 18511973078.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46843676356 + 40194235225 = 216434^2 + 200485^2 .

It is a cyclic number.

It is not a de Polignac number, because 87037911581 - 2⁶ = 87037911517 is a prime.

It is a super-2 number, since 2×87037911581² (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 (87037911589) 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, 43518955790 + 43518955791.

It is an arithmetic number, because the mean of its divisors is an integer number (43518955791).

Almost surely, 2^87037911581 is an apocalyptic number.

It is an amenable number.

87037911581 is a deficient number, since it is larger than the sum of its proper divisors (1).

87037911581 is an equidigital number, since it uses as much as digits as its factorization.

87037911581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 423360, while the sum is 50.

The spelling of 87037911581 in words is "eighty-seven billion, thirty-seven million, nine hundred eleven thousand, five hundred eighty-one".