90251089 has 4 divisors (see below), whose sum is σ = 90276660. Its totient is φ = 90225520.

The previous prime is 90251087. The next prime is 90251099. The reversal of 90251089 is 98015209.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 89870400 + 380689 = 9480^2 + 617^2 .

It is a cyclic number.

It is not a de Polignac number, because 90251089 - 2¹ = 90251087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90251081) 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, 6442 + ... + 14899.

It is an arithmetic number, because the mean of its divisors is an integer number (22569165).

Almost surely, 2^90251089 is an apocalyptic number.

It is an amenable number.

90251089 is a deficient number, since it is larger than the sum of its proper divisors (25571).

90251089 is a wasteful number, since it uses less digits than its factorization.

90251089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25570.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 90251089 is about 9500.0573156166. The cubic root of 90251089 is about 448.5568400764.

It can be divided in two parts, 9025 and 1089, that multiplied together give a square (9828225 = 3135²).

The spelling of 90251089 in words is "ninety million, two hundred fifty-one thousand, eighty-nine".