91855315 has 4 divisors (see below), whose sum is σ = 110226384. Its totient is φ = 73484248.

The previous prime is 91855303. The next prime is 91855319. The reversal of 91855315 is 51355819.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51355819 = 47 ⋅1092677.

It is a cyclic number.

It is not a de Polignac number, because 91855315 - 2²³ = 83466707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91855319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9185527 + ... + 9185536.

It is an arithmetic number, because the mean of its divisors is an integer number (27556596).

Almost surely, 2^91855315 is an apocalyptic number.

91855315 is a deficient number, since it is larger than the sum of its proper divisors (18371069).

91855315 is a wasteful number, since it uses less digits than its factorization.

91855315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18371068.

The product of its digits is 27000, while the sum is 37.

The square root of 91855315 is about 9584.1178519465. The cubic root of 91855315 is about 451.1989672774.

The spelling of 91855315 in words is "ninety-one million, eight hundred fifty-five thousand, three hundred fifteen".