90251751 has 4 divisors (see below), whose sum is σ = 120335672. Its totient is φ = 60167832.

The previous prime is 90251737. The next prime is 90251753. The reversal of 90251751 is 15715209.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15715209 = 3 ⋅5238403.

It is not a de Polignac number, because 90251751 - 2⁵ = 90251719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90251753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15041956 + ... + 15041961.

It is an arithmetic number, because the mean of its divisors is an integer number (30083918).

Almost surely, 2^90251751 is an apocalyptic number.

90251751 is a deficient number, since it is larger than the sum of its proper divisors (30083921).

90251751 is a wasteful number, since it uses less digits than its factorization.

90251751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30083920.

The product of its (nonzero) digits is 3150, while the sum is 30.

The square root of 90251751 is about 9500.0921574477. The cubic root of 90251751 is about 448.5579368089.

The spelling of 90251751 in words is "ninety million, two hundred fifty-one thousand, seven hundred fifty-one".