90984981 has 8 divisors (see below), whose sum is σ = 121425280. Its totient is φ = 60600672.

The previous prime is 90984931. The next prime is 90985007. The reversal of 90984981 is 18948909.

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

It is not a de Polignac number, because 90984981 - 2⁹ = 90984469 is a prime.

It is a super-2 number, since 2×90984981² = 16556533535140722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90984981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90984931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10045 + ... + 16818.

It is an arithmetic number, because the mean of its divisors is an integer number (15178160).

Almost surely, 2^90984981 is an apocalyptic number.

It is an amenable number.

90984981 is a deficient number, since it is larger than the sum of its proper divisors (30440299).

90984981 is a wasteful number, since it uses less digits than its factorization.

90984981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27995.

The product of its (nonzero) digits is 186624, while the sum is 48.

The square root of 90984981 is about 9538.6047721876. The cubic root of 90984981 is about 449.7693978977.

The spelling of 90984981 in words is "ninety million, nine hundred eighty-four thousand, nine hundred eighty-one".