90401521 has 24 divisors (see below), whose sum is σ = 107980800. Its totient is φ = 75442752.

The previous prime is 90401513. The next prime is 90401533. The reversal of 90401521 is 12510409.

It is not a de Polignac number, because 90401521 - 2³ = 90401513 is a prime.

It is a super-2 number, since 2×90401521² = 16344869998226882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90401492 and 90401501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90401501) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 454180 + ... + 454378.

It is an arithmetic number, because the mean of its divisors is an integer number (4499200).

Almost surely, 2^90401521 is an apocalyptic number.

It is an amenable number.

90401521 is a deficient number, since it is larger than the sum of its proper divisors (17579279).

90401521 is a wasteful number, since it uses less digits than its factorization.

90401521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413 (or 406 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 90401521 is about 9507.9714450560. The cubic root of 90401521 is about 448.8059223764.

The spelling of 90401521 in words is "ninety million, four hundred one thousand, five hundred twenty-one".