90602991 has 12 divisors (see below), whose sum is σ = 130954720. Its totient is φ = 60363360.

The previous prime is 90602983. The next prime is 90603017. The reversal of 90602991 is 19920609.

It is not a de Polignac number, because 90602991 - 2³ = 90602983 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90602971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22155 + ... + 25923.

Almost surely, 2^90602991 is an apocalyptic number.

90602991 is a deficient number, since it is larger than the sum of its proper divisors (40351729).

90602991 is a wasteful number, since it uses less digits than its factorization.

90602991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6446 (or 6443 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 90602991 is about 9518.5603428250. The cubic root of 90602991 is about 449.1390799020.

The spelling of 90602991 in words is "ninety million, six hundred two thousand, nine hundred ninety-one".