90847521 has 8 divisors (see below), whose sum is σ = 134588960. Its totient is φ = 60564996.

The previous prime is 90847457. The next prime is 90847571. The reversal of 90847521 is 12574809.

90847521 is a `hidden beast` number, since 90 + 8 + 47 + 521 = 666.

It is not a de Polignac number, because 90847521 - 2⁶ = 90847457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90847571) 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, 1682335 + ... + 1682388.

It is an arithmetic number, because the mean of its divisors is an integer number (16823620).

Almost surely, 2^90847521 is an apocalyptic number.

It is an amenable number.

90847521 is a deficient number, since it is larger than the sum of its proper divisors (43741439).

90847521 is a wasteful number, since it uses less digits than its factorization.

90847521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3364732 (or 3364726 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 90847521 is about 9531.3965923153. The cubic root of 90847521 is about 449.5427800460.

The spelling of 90847521 in words is "ninety million, eight hundred forty-seven thousand, five hundred twenty-one".