90182981 has 6 divisors (see below), whose sum is σ = 104906790. Its totient is φ = 77299656.

The previous prime is 90182971. The next prime is 90183031. The reversal of 90182981 is 18928109.

It can be written as a sum of positive squares in only one way, i.e., 87590881 + 2592100 = 9359^2 + 1610^2 .

It is a de Polignac number, because none of the positive numbers 2^k-90182981 is a prime.

It is a super-2 number, since 2×90182981² = 16265940124092722, 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 (90182921) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 920186 + ... + 920283.

It is an arithmetic number, because the mean of its divisors is an integer number (17484465).

Almost surely, 2^90182981 is an apocalyptic number.

It is an amenable number.

90182981 is a deficient number, since it is larger than the sum of its proper divisors (14723809).

90182981 is a wasteful number, since it uses less digits than its factorization.

90182981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1840483 (or 1840476 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 90182981 is about 9496.4720291274. The cubic root of 90182981 is about 448.4439771819.

The spelling of 90182981 in words is "ninety million, one hundred eighty-two thousand, nine hundred eighty-one".