91981465 has 8 divisors (see below), whose sum is σ = 110786688. Its totient is φ = 73312560.

The previous prime is 91981459. The next prime is 91981471. The reversal of 91981465 is 56418919.

It is an interprime number because it is at equal distance from previous prime (91981459) and next prime (91981471).

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

It is not a de Polignac number, because 91981465 - 2³ = 91981457 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, 32587 + ... + 35296.

It is an arithmetic number, because the mean of its divisors is an integer number (13848336).

Almost surely, 2^91981465 is an apocalyptic number.

It is an amenable number.

91981465 is a deficient number, since it is larger than the sum of its proper divisors (18805223).

91981465 is a wasteful number, since it uses less digits than its factorization.

91981465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68159.

The product of its digits is 77760, while the sum is 43.

The square root of 91981465 is about 9590.6967942898. The cubic root of 91981465 is about 451.4054249840.

The spelling of 91981465 in words is "ninety-one million, nine hundred eighty-one thousand, four hundred sixty-five".