91455686331 has 4 divisors (see below), whose sum is σ = 121940915112. Its totient is φ = 60970457552.

The previous prime is 91455686327. The next prime is 91455686339. The reversal of 91455686331 is 13368655419.

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 91455686331 - 2² = 91455686327 is a prime.

It is a super-2 number, since 2×91455686331² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91455686339) 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, 15242614386 + ... + 15242614391.

It is an arithmetic number, because the mean of its divisors is an integer number (30485228778).

Almost surely, 2^91455686331 is an apocalyptic number.

91455686331 is a deficient number, since it is larger than the sum of its proper divisors (30485228781).

91455686331 is a wasteful number, since it uses less digits than its factorization.

91455686331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30485228780.

The product of its digits is 2332800, while the sum is 51.

The spelling of 91455686331 in words is "ninety-one billion, four hundred fifty-five million, six hundred eighty-six thousand, three hundred thirty-one".