90992521 has 3 divisors (see below), whose sum is σ = 91002061. Its totient is φ = 90982982.

The previous prime is 90992519. The next prime is 90992537. The reversal of 90992521 is 12529909.

The square root of 90992521 is 9539.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12529909 = 7 ⋅1789987.

It is not a de Polignac number, because 90992521 - 2¹ = 90992519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90992581) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4770 + ... + 14308.

Almost surely, 2^90992521 is an apocalyptic number.

90992521 is the 9539-th square number.

90992521 is the 4770-th centered octagonal number.

It is an amenable number.

90992521 is a deficient number, since it is larger than the sum of its proper divisors (9540).

90992521 is an frugal number, since it uses more digits than its factorization.

90992521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19078 (or 9539 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 37.

The cubic root of 90992521 is about 449.7818218075.

The spelling of 90992521 in words is "ninety million, nine hundred ninety-two thousand, five hundred twenty-one".