90920621 has 4 divisors (see below), whose sum is σ = 99186144. Its totient is φ = 82655100.

The previous prime is 90920611. The next prime is 90920623. The reversal of 90920621 is 12602909.

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.

It is not a de Polignac number, because 90920621 - 2¹⁰ = 90919597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90920623) 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, 4132745 + ... + 4132766.

It is an arithmetic number, because the mean of its divisors is an integer number (24796536).

Almost surely, 2^90920621 is an apocalyptic number.

It is an amenable number.

90920621 is a deficient number, since it is larger than the sum of its proper divisors (8265523).

90920621 is a wasteful number, since it uses less digits than its factorization.

90920621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8265522.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 90920621 is about 9535.2305163536. The cubic root of 90920621 is about 449.6633218316.

The spelling of 90920621 in words is "ninety million, nine hundred twenty thousand, six hundred twenty-one".