90477521 has 8 divisors (see below), whose sum is σ = 91651560. Its totient is φ = 89309952.

The previous prime is 90477509. The next prime is 90477559. The reversal of 90477521 is 12577409.

It can be written as a sum of positive squares in 4 ways, for example, as 38925121 + 51552400 = 6239^2 + 7180^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90477521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90477571) 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 7 ways as a sum of consecutive naturals, for example, 30521 + ... + 33353.

It is an arithmetic number, because the mean of its divisors is an integer number (11456445).

Almost surely, 2^90477521 is an apocalyptic number.

It is an amenable number.

90477521 is a deficient number, since it is larger than the sum of its proper divisors (1174039).

90477521 is a wasteful number, since it uses less digits than its factorization.

90477521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3235.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 90477521 is about 9511.9672518360. The cubic root of 90477521 is about 448.9316566034.

The spelling of 90477521 in words is "ninety million, four hundred seventy-seven thousand, five hundred twenty-one".