90547921 has 4 divisors (see below), whose sum is σ = 90625392. Its totient is φ = 90470452.

The previous prime is 90547913. The next prime is 90547957. The reversal of 90547921 is 12974509.

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 a cyclic number.

It is not a de Polignac number, because 90547921 - 2³ = 90547913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90541921) 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, 36955 + ... + 39328.

It is an arithmetic number, because the mean of its divisors is an integer number (22656348).

Almost surely, 2^90547921 is an apocalyptic number.

It is an amenable number.

90547921 is a deficient number, since it is larger than the sum of its proper divisors (77471).

90547921 is a wasteful number, since it uses less digits than its factorization.

90547921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77470.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 90547921 is about 9515.6671337327. The cubic root of 90547921 is about 449.0480633995.

The spelling of 90547921 in words is "ninety million, five hundred forty-seven thousand, nine hundred twenty-one".