90821517 has 16 divisors (see below), whose sum is σ = 122769792. Its totient is φ = 59716800.

The previous prime is 90821513. The next prime is 90821551. The reversal of 90821517 is 71512809.

It is not a de Polignac number, because 90821517 - 2² = 90821513 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90821513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70483 + ... + 71759.

It is an arithmetic number, because the mean of its divisors is an integer number (7673112).

Almost surely, 2^90821517 is an apocalyptic number.

It is an amenable number.

90821517 is a deficient number, since it is larger than the sum of its proper divisors (31948275).

90821517 is a wasteful number, since it uses less digits than its factorization.

90821517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1588.

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 90821517 is about 9530.0323714036. The cubic root of 90821517 is about 449.4998838985.

The spelling of 90821517 in words is "ninety million, eight hundred twenty-one thousand, five hundred seventeen".