91372155 has 16 divisors (see below), whose sum is σ = 167080704. Its totient is φ = 41770080.

The previous prime is 91372153. The next prime is 91372163. The reversal of 91372155 is 55127319.

It is not a de Polignac number, because 91372155 - 2¹ = 91372153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91372153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 435001 + ... + 435210.

It is an arithmetic number, because the mean of its divisors is an integer number (10442544).

Almost surely, 2^91372155 is an apocalyptic number.

91372155 is a deficient number, since it is larger than the sum of its proper divisors (75708549).

91372155 is a wasteful number, since it uses less digits than its factorization.

91372155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870226.

The product of its digits is 9450, while the sum is 33.

The square root of 91372155 is about 9558.8783337795. The cubic root of 91372155 is about 450.4064722408.

The spelling of 91372155 in words is "ninety-one million, three hundred seventy-two thousand, one hundred fifty-five".