91872145 has 16 divisors (see below), whose sum is σ = 115992000. Its totient is φ = 69754048.

The previous prime is 91872113. The next prime is 91872173. The reversal of 91872145 is 54127819.

It is not a de Polignac number, because 91872145 - 2⁵ = 91872113 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3186 + ... + 13924.

It is an arithmetic number, because the mean of its divisors is an integer number (7249500).

Almost surely, 2^91872145 is an apocalyptic number.

It is an amenable number.

91872145 is a deficient number, since it is larger than the sum of its proper divisors (24119855).

91872145 is a wasteful number, since it uses less digits than its factorization.

91872145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10832.

The product of its digits is 20160, while the sum is 37.

The square root of 91872145 is about 9584.9958268118. The cubic root of 91872145 is about 451.2265222603.

The spelling of 91872145 in words is "ninety-one million, eight hundred seventy-two thousand, one hundred forty-five".