91926021 has 16 divisors (see below), whose sum is σ = 141576768. Its totient is φ = 52435200.

The previous prime is 91926017. The next prime is 91926049. The reversal of 91926021 is 12062919.

It is a happy number.

It is not a de Polignac number, because 91926021 - 2² = 91926017 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91926021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91926001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81370 + ... + 82491.

It is an arithmetic number, because the mean of its divisors is an integer number (8848548).

Almost surely, 2^91926021 is an apocalyptic number.

It is an amenable number.

91926021 is a deficient number, since it is larger than the sum of its proper divisors (49650747).

91926021 is a wasteful number, since it uses less digits than its factorization.

91926021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163892.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 91926021 is about 9587.8058490981. The cubic root of 91926021 is about 451.3147083281.

The spelling of 91926021 in words is "ninety-one million, nine hundred twenty-six thousand, twenty-one".