90502981 has 4 divisors (see below), whose sum is σ = 93422464. Its totient is φ = 87583500.

The previous prime is 90502963. The next prime is 90502987. The reversal of 90502981 is 18920509.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18920509 = 31 ⋅610339.

It is a cyclic number.

It is not a de Polignac number, because 90502981 - 2¹⁵ = 90470213 is a prime.

It is a super-2 number, since 2×90502981² = 16381579139772722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90502987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1459695 + ... + 1459756.

It is an arithmetic number, because the mean of its divisors is an integer number (23355616).

Almost surely, 2^90502981 is an apocalyptic number.

It is an amenable number.

90502981 is a deficient number, since it is larger than the sum of its proper divisors (2919483).

90502981 is a wasteful number, since it uses less digits than its factorization.

90502981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2919482.

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

The square root of 90502981 is about 9513.3054718116. The cubic root of 90502981 is about 448.9737618244.

The spelling of 90502981 in words is "ninety million, five hundred two thousand, nine hundred eighty-one".