91355155 has 4 divisors (see below), whose sum is σ = 109626192. Its totient is φ = 73084120.

The previous prime is 91355153. The next prime is 91355197. The reversal of 91355155 is 55155319.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55155319 = 2473 ⋅22303.

It is not a de Polignac number, because 91355155 - 2¹ = 91355153 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91355155.

It is not an unprimeable number, because it can be changed into a prime (91355153) 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, 9135511 + ... + 9135520.

It is an arithmetic number, because the mean of its divisors is an integer number (27406548).

Almost surely, 2^91355155 is an apocalyptic number.

91355155 is a deficient number, since it is larger than the sum of its proper divisors (18271037).

91355155 is a wasteful number, since it uses less digits than its factorization.

91355155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18271036.

The product of its digits is 16875, while the sum is 34.

The square root of 91355155 is about 9557.9890667441. The cubic root of 91355155 is about 450.3785374542.

The spelling of 91355155 in words is "ninety-one million, three hundred fifty-five thousand, one hundred fifty-five".