90390961 has 4 divisors (see below), whose sum is σ = 95148400. Its totient is φ = 85633524.

The previous prime is 90390929. The next prime is 90390967. The reversal of 90390961 is 16909309.

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: 16909309 = 193 ⋅87613.

It is a cyclic number.

It is not a de Polignac number, because 90390961 - 2⁵ = 90390929 is a prime.

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 90390961.

It is not an unprimeable number, because it can be changed into a prime (90390967) 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, 2378691 + ... + 2378728.

It is an arithmetic number, because the mean of its divisors is an integer number (23787100).

Almost surely, 2^90390961 is an apocalyptic number.

It is an amenable number.

90390961 is a deficient number, since it is larger than the sum of its proper divisors (4757439).

90390961 is a wasteful number, since it uses less digits than its factorization.

90390961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4757438.

The product of its (nonzero) digits is 13122, while the sum is 37.

The square root of 90390961 is about 9507.4161053359. The cubic root of 90390961 is about 448.7884463611.

The spelling of 90390961 in words is "ninety million, three hundred ninety thousand, nine hundred sixty-one".