91919406 has 16 divisors (see below), whose sum is σ = 184520448. Its totient is φ = 30526200.

The previous prime is 91919383. The next prime is 91919413. The reversal of 91919406 is 60491919.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26640 + ... + 29891.

It is an arithmetic number, because the mean of its divisors is an integer number (11532528).

Almost surely, 2^91919406 is an apocalyptic number.

91919406 is an abundant number, since it is smaller than the sum of its proper divisors (92601042).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91919406 is a wasteful number, since it uses less digits than its factorization.

91919406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56807.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 91919406 is about 9587.4608734534. The cubic root of 91919406 is about 451.3038825271.

The spelling of 91919406 in words is "ninety-one million, nine hundred nineteen thousand, four hundred six".