91321385 has 16 divisors (see below), whose sum is σ = 116515584. Its totient is φ = 68557632.

The previous prime is 91321367. The next prime is 91321403. The reversal of 91321385 is 58312319.

It is an interprime number because it is at equal distance from previous prime (91321367) and next prime (91321403).

It is a cyclic number.

It is not a de Polignac number, because 91321385 - 2¹⁴ = 91305001 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1397 + ... + 13586.

It is an arithmetic number, because the mean of its divisors is an integer number (7282224).

Almost surely, 2^91321385 is an apocalyptic number.

It is an amenable number.

91321385 is a deficient number, since it is larger than the sum of its proper divisors (25194199).

91321385 is a wasteful number, since it uses less digits than its factorization.

91321385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15064.

The product of its digits is 6480, while the sum is 32.

The square root of 91321385 is about 9556.2223184687. Note that the first 3 decimals coincide. The cubic root of 91321385 is about 450.3230355410.

The spelling of 91321385 in words is "ninety-one million, three hundred twenty-one thousand, three hundred eighty-five".