90909031 has 2 divisors, whose sum is σ = 90909032. Its totient is φ = 90909030.

The previous prime is 90908959. The next prime is 90909059. The reversal of 90909031 is 13090909.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90909031 - 2²³ = 82520423 is a prime.

It is a super-2 number, since 2×90909031² = 16528903834717922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 90908984 and 90909002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90909061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45454515 + 45454516.

It is an arithmetic number, because the mean of its divisors is an integer number (45454516).

Almost surely, 2^90909031 is an apocalyptic number.

90909031 is a deficient number, since it is larger than the sum of its proper divisors (1).

90909031 is an equidigital number, since it uses as much as digits as its factorization.

90909031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2187, while the sum is 31.

The square root of 90909031 is about 9534.6227507962. The cubic root of 90909031 is about 449.6442142507.

The spelling of 90909031 in words is "ninety million, nine hundred nine thousand, thirty-one".