91532421 has 12 divisors (see below), whose sum is σ = 132743520. Its totient is φ = 60777000.

The previous prime is 91532417. The next prime is 91532449. The reversal of 91532421 is 12423519.

91532421 is a `hidden beast` number, since 91 + 532 + 42 + 1 = 666.

It is not a de Polignac number, because 91532421 - 2² = 91532417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91532411) 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 11 ways as a sum of consecutive naturals, for example, 18001 + ... + 22518.

It is an arithmetic number, because the mean of its divisors is an integer number (11061960).

Almost surely, 2^91532421 is an apocalyptic number.

It is an amenable number.

91532421 is a deficient number, since it is larger than the sum of its proper divisors (41211099).

91532421 is a wasteful number, since it uses less digits than its factorization.

91532421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40776 (or 40773 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 91532421 is about 9567.2577575813. The cubic root of 91532421 is about 450.6696548296.

The spelling of 91532421 in words is "ninety-one million, five hundred thirty-two thousand, four hundred twenty-one".