90402331 has 4 divisors (see below), whose sum is σ = 90551872. Its totient is φ = 90252792.

The previous prime is 90402329. The next prime is 90402349. The reversal of 90402331 is 13320409.

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 90402331 - 2¹ = 90402329 is a prime.

It is a super-2 number, since 2×90402331² = 16345162900467122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90402391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73860 + ... + 75073.

It is an arithmetic number, because the mean of its divisors is an integer number (22637968).

Almost surely, 2^90402331 is an apocalyptic number.

90402331 is a deficient number, since it is larger than the sum of its proper divisors (149541).

90402331 is a wasteful number, since it uses less digits than its factorization.

90402331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149540.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 90402331 is about 9508.0140407974. The cubic root of 90402331 is about 448.8072628101.

The spelling of 90402331 in words is "ninety million, four hundred two thousand, three hundred thirty-one".