91379665 has 8 divisors (see below), whose sum is σ = 118090728. Its totient is φ = 67480320.

The previous prime is 91379657. The next prime is 91379671. The reversal of 91379665 is 56697319.

It can be written as a sum of positive squares in 4 ways, for example, as 5184 + 91374481 = 72^2 + 9559^2 .

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

It is not a de Polignac number, because 91379665 - 2³ = 91379657 is a prime.

It is a Duffinian 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, 702856 + ... + 702985.

It is an arithmetic number, because the mean of its divisors is an integer number (14761341).

Almost surely, 2^91379665 is an apocalyptic number.

It is an amenable number.

91379665 is a deficient number, since it is larger than the sum of its proper divisors (26711063).

91379665 is a wasteful number, since it uses less digits than its factorization.

91379665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1405859.

The product of its digits is 306180, while the sum is 46.

The square root of 91379665 is about 9559.2711542251. The cubic root of 91379665 is about 450.4188117401.

It can be divided in two parts, 91 and 379665, that added together give a triangular number (379756 = T₈₇₁).

The spelling of 91379665 in words is "ninety-one million, three hundred seventy-nine thousand, six hundred sixty-five".