90031565 has 8 divisors (see below), whose sum is σ = 116348568. Its totient is φ = 66484800.

The previous prime is 90031559. The next prime is 90031589. The reversal of 90031565 is 56513009.

It can be written as a sum of positive squares in 4 ways, for example, as 9229444 + 80802121 = 3038^2 + 8989^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 90031565 - 2⁸ = 90031309 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 7 ways as a sum of consecutive naturals, for example, 692486 + ... + 692615.

It is an arithmetic number, because the mean of its divisors is an integer number (14543571).

Almost surely, 2^90031565 is an apocalyptic number.

It is an amenable number.

90031565 is a deficient number, since it is larger than the sum of its proper divisors (26317003).

90031565 is a wasteful number, since it uses less digits than its factorization.

90031565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1385119.

The product of its (nonzero) digits is 4050, while the sum is 29.

The square root of 90031565 is about 9488.4964562358. The cubic root of 90031565 is about 448.1928594731.

The spelling of 90031565 in words is "ninety million, thirty-one thousand, five hundred sixty-five".