91022913 has 32 divisors (see below), whose sum is σ = 147409920. Its totient is φ = 55261440.

The previous prime is 91022887. The next prime is 91022927. The reversal of 91022913 is 31922019.

It is not a de Polignac number, because 91022913 - 2¹² = 91018817 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (91022413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11031 + ... + 17427.

It is an arithmetic number, because the mean of its divisors is an integer number (4606560).

Almost surely, 2^91022913 is an apocalyptic number.

91022913 is a gapful number since it is divisible by the number (93) formed by its first and last digit.

It is an amenable number.

91022913 is a deficient number, since it is larger than the sum of its proper divisors (56387007).

91022913 is a wasteful number, since it uses less digits than its factorization.

91022913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6454 (or 6448 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 91022913 is about 9540.5929061039. The cubic root of 91022913 is about 449.8318927633.

The spelling of 91022913 in words is "ninety-one million, twenty-two thousand, nine hundred thirteen".