91253235631 has 4 divisors (see below), whose sum is σ = 91258083000. Its totient is φ = 91248388264.

The previous prime is 91253235629. The next prime is 91253235637. The reversal of 91253235631 is 13653235219.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91253235631 - 2¹ = 91253235629 is a prime.

It is a super-2 number, since 2×91253235631² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91253235637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2395336 + ... + 2433133.

It is an arithmetic number, because the mean of its divisors is an integer number (22814520750).

Almost surely, 2^91253235631 is an apocalyptic number.

91253235631 is a deficient number, since it is larger than the sum of its proper divisors (4847369).

91253235631 is a wasteful number, since it uses less digits than its factorization.

91253235631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4847368.

The product of its digits is 145800, while the sum is 40.

The spelling of 91253235631 in words is "ninety-one billion, two hundred fifty-three million, two hundred thirty-five thousand, six hundred thirty-one".