91542365639 has 2 divisors, whose sum is σ = 91542365640. Its totient is φ = 91542365638.

The previous prime is 91542365633. The next prime is 91542365641. The reversal of 91542365639 is 93656324519.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91542365639 - 2³⁶ = 22822888903 is a prime.

It is a Sophie Germain prime.

Together with 91542365641, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91542365633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45771182819 + 45771182820.

It is an arithmetic number, because the mean of its divisors is an integer number (45771182820).

Almost surely, 2^91542365639 is an apocalyptic number.

91542365639 is a deficient number, since it is larger than the sum of its proper divisors (1).

91542365639 is an equidigital number, since it uses as much as digits as its factorization.

91542365639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5248800, while the sum is 53.

The spelling of 91542365639 in words is "ninety-one billion, five hundred forty-two million, three hundred sixty-five thousand, six hundred thirty-nine".