91535771641 has 4 divisors (see below), whose sum is σ = 91537944400. Its totient is φ = 91533598884.

The previous prime is 91535771633. The next prime is 91535771659. The reversal of 91535771641 is 14617753519.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91535771641 - 2³ = 91535771633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91535771441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1021911 + ... + 1107868.

It is an arithmetic number, because the mean of its divisors is an integer number (22884486100).

Almost surely, 2^91535771641 is an apocalyptic number.

It is an amenable number.

91535771641 is a deficient number, since it is larger than the sum of its proper divisors (2172759).

91535771641 is a wasteful number, since it uses less digits than its factorization.

91535771641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2172758.

The product of its digits is 793800, while the sum is 49.

The spelling of 91535771641 in words is "ninety-one billion, five hundred thirty-five million, seven hundred seventy-one thousand, six hundred forty-one".