90521331 has 4 divisors (see below), whose sum is σ = 120695112. Its totient is φ = 60347552.

The previous prime is 90521323. The next prime is 90521341. The reversal of 90521331 is 13312509.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90521331 - 2³ = 90521323 is a prime.

It is a super-2 number, since 2×90521331² = 16388222732023122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90521341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15086886 + ... + 15086891.

It is an arithmetic number, because the mean of its divisors is an integer number (30173778).

Almost surely, 2^90521331 is an apocalyptic number.

90521331 is a deficient number, since it is larger than the sum of its proper divisors (30173781).

90521331 is a wasteful number, since it uses less digits than its factorization.

90521331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30173780.

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 90521331 is about 9514.2698616342. The cubic root of 90521331 is about 449.0041037781.

The spelling of 90521331 in words is "ninety million, five hundred twenty-one thousand, three hundred thirty-one".