90551931 has 16 divisors (see below), whose sum is σ = 123941664. Its totient is φ = 58782464.

The previous prime is 90551927. The next prime is 90551941. The reversal of 90551931 is 13915509.

It is a cyclic number.

It is not a de Polignac number, because 90551931 - 2² = 90551927 is a prime.

It is a super-2 number, since 2×90551931² = 16399304415657522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 90551892 and 90551901.

It is not an unprimeable number, because it can be changed into a prime (90551941) 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 15 ways as a sum of consecutive naturals, for example, 19705 + ... + 23861.

It is an arithmetic number, because the mean of its divisors is an integer number (7746354).

Almost surely, 2^90551931 is an apocalyptic number.

90551931 is a deficient number, since it is larger than the sum of its proper divisors (33389733).

90551931 is a wasteful number, since it uses less digits than its factorization.

90551931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4350.

The product of its (nonzero) digits is 6075, while the sum is 33.

The square root of 90551931 is about 9515.8778365425. The cubic root of 90551931 is about 449.0546921405.

The spelling of 90551931 in words is "ninety million, five hundred fifty-one thousand, nine hundred thirty-one".