90251165 has 4 divisors (see below), whose sum is σ = 108301404. Its totient is φ = 72200928.

The previous prime is 90251123. The next prime is 90251173. The reversal of 90251165 is 56115209.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56115209 = 409 ⋅137201.

It can be written as a sum of positive squares in 2 ways, for example, as 33790969 + 56460196 = 5813^2 + 7514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90251165 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9025112 + ... + 9025121.

It is an arithmetic number, because the mean of its divisors is an integer number (27075351).

Almost surely, 2^90251165 is an apocalyptic number.

It is an amenable number.

90251165 is a deficient number, since it is larger than the sum of its proper divisors (18050239).

90251165 is a wasteful number, since it uses less digits than its factorization.

90251165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18050238.

The product of its (nonzero) digits is 2700, while the sum is 29.

The square root of 90251165 is about 9500.0613155916. The cubic root of 90251165 is about 448.5569659856.

The spelling of 90251165 in words is "ninety million, two hundred fifty-one thousand, one hundred sixty-five".