91979405 has 8 divisors (see below), whose sum is σ = 126143232. Its totient is φ = 63071568.

The previous prime is 91979347. The next prime is 91979411. The reversal of 91979405 is 50497919.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91979405 - 2⁶ = 91979341 is a prime.

It is a Duffinian number.

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, 1313957 + ... + 1314026.

It is an arithmetic number, because the mean of its divisors is an integer number (15767904).

Almost surely, 2^91979405 is an apocalyptic number.

It is an amenable number.

91979405 is a deficient number, since it is larger than the sum of its proper divisors (34163827).

91979405 is a wasteful number, since it uses less digits than its factorization.

91979405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2627995.

The product of its (nonzero) digits is 102060, while the sum is 44.

The square root of 91979405 is about 9590.5893979463. The cubic root of 91979405 is about 451.4020550946.

The spelling of 91979405 in words is "ninety-one million, nine hundred seventy-nine thousand, four hundred five".