91622391 has 16 divisors (see below), whose sum is σ = 144119808. Its totient is φ = 50666400.

The previous prime is 91622371. The next prime is 91622393. The reversal of 91622391 is 19322619.

It is not a de Polignac number, because 91622391 - 2⁶ = 91622327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91622393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69720 + ... + 71021.

It is an arithmetic number, because the mean of its divisors is an integer number (9007488).

Almost surely, 2^91622391 is an apocalyptic number.

91622391 is a deficient number, since it is larger than the sum of its proper divisors (52497417).

91622391 is a wasteful number, since it uses less digits than its factorization.

91622391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140782.

The product of its digits is 5832, while the sum is 33.

The square root of 91622391 is about 9571.9585770102. The cubic root of 91622391 is about 450.8172654458.

The spelling of 91622391 in words is "ninety-one million, six hundred twenty-two thousand, three hundred ninety-one".