91479999 has 8 divisors (see below), whose sum is σ = 131355952. Its totient is φ = 56295360.

The previous prime is 91479923. The next prime is 91480069. The reversal of 91479999 is 99997419.

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

It is not a de Polignac number, because 91479999 - 2⁸ = 91479743 is a prime.

91479999 is a modest number, since divided by 9999 gives 9147 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91479299) 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, 1172782 + ... + 1172859.

It is an arithmetic number, because the mean of its divisors is an integer number (16419494).

Almost surely, 2^91479999 is an apocalyptic number.

91479999 is a deficient number, since it is larger than the sum of its proper divisors (39875953).

91479999 is a wasteful number, since it uses less digits than its factorization.

91479999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2345657.

The product of its digits is 1653372, while the sum is 57.

The square root of 91479999 is about 9564.5177086981. The cubic root of 91479999 is about 450.5836032937.

The spelling of 91479999 in words is "ninety-one million, four hundred seventy-nine thousand, nine hundred ninety-nine".