90802521 has 12 divisors (see below), whose sum is σ = 132820480. Its totient is φ = 59768280.

The previous prime is 90802511. The next prime is 90802561. The reversal of 90802521 is 12520809.

It is not a de Polignac number, because 90802521 - 2⁹ = 90802009 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90802511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63145 + ... + 64566.

Almost surely, 2^90802521 is an apocalyptic number.

It is an amenable number.

90802521 is a deficient number, since it is larger than the sum of its proper divisors (42017959).

90802521 is a wasteful number, since it uses less digits than its factorization.

90802521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127796 (or 127793 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 90802521 is about 9529.0356804873. The cubic root of 90802521 is about 449.4685429584.

The spelling of 90802521 in words is "ninety million, eight hundred two thousand, five hundred twenty-one".