90524921 has 8 divisors (see below), whose sum is σ = 93955080. Its totient is φ = 87115392.

The previous prime is 90524887. The next prime is 90524963. The reversal of 90524921 is 12942509.

It can be written as a sum of positive squares in 4 ways, for example, as 2371600 + 88153321 = 1540^2 + 9389^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 90524921 - 2⁶ = 90524857 is a prime.

It is a super-2 number, since 2×90524921² = 16389522644112482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90524971) 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, 4091 + ... + 14063.

It is an arithmetic number, because the mean of its divisors is an integer number (11744385).

Almost surely, 2^90524921 is an apocalyptic number.

It is an amenable number.

90524921 is a deficient number, since it is larger than the sum of its proper divisors (3430159).

90524921 is a wasteful number, since it uses less digits than its factorization.

90524921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10315.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 90524921 is about 9514.4585237416. The cubic root of 90524921 is about 449.0100394083.

The spelling of 90524921 in words is "ninety million, five hundred twenty-four thousand, nine hundred twenty-one".