87564461939 has 2 divisors, whose sum is σ = 87564461940. Its totient is φ = 87564461938.

The previous prime is 87564461893. The next prime is 87564461947. The reversal of 87564461939 is 93916446578.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87564461939 is a prime.

It is not a weakly prime, because it can be changed into another prime (87564461989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43782230969 + 43782230970.

It is an arithmetic number, because the mean of its divisors is an integer number (43782230970).

Almost surely, 2^87564461939 is an apocalyptic number.

87564461939 is a deficient number, since it is larger than the sum of its proper divisors (1).

87564461939 is an equidigital number, since it uses as much as digits as its factorization.

87564461939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39191040, while the sum is 62.

The spelling of 87564461939 in words is "eighty-seven billion, five hundred sixty-four million, four hundred sixty-one thousand, nine hundred thirty-nine".