91979007 has 8 divisors (see below), whose sum is σ = 124469376. Its totient is φ = 60403992.

The previous prime is 91978987. The next prime is 91979029. The reversal of 91979007 is 70097919.

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

It is not a de Polignac number, because 91979007 - 2⁸ = 91978751 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91979007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91979087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 228603 + ... + 229004.

It is an arithmetic number, because the mean of its divisors is an integer number (15558672).

Almost surely, 2^91979007 is an apocalyptic number.

91979007 is a deficient number, since it is larger than the sum of its proper divisors (32490369).

91979007 is a wasteful number, since it uses less digits than its factorization.

91979007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457677.

The product of its (nonzero) digits is 35721, while the sum is 42.

The square root of 91979007 is about 9590.5686484170. The cubic root of 91979007 is about 451.4014040130.

The spelling of 91979007 in words is "ninety-one million, nine hundred seventy-nine thousand, seven".