90031901 has 2 divisors, whose sum is σ = 90031902. Its totient is φ = 90031900.

The previous prime is 90031897. The next prime is 90031927. The reversal of 90031901 is 10913009.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87703225 + 2328676 = 9365^2 + 1526^2 .

It is a cyclic number.

It is not a de Polignac number, because 90031901 - 2² = 90031897 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90031301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45015950 + 45015951.

It is an arithmetic number, because the mean of its divisors is an integer number (45015951).

Almost surely, 2^90031901 is an apocalyptic number.

It is an amenable number.

90031901 is a deficient number, since it is larger than the sum of its proper divisors (1).

90031901 is an equidigital number, since it uses as much as digits as its factorization.

90031901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 243, while the sum is 23.

The square root of 90031901 is about 9488.5141618696. The cubic root of 90031901 is about 448.1934170279.

The spelling of 90031901 in words is "ninety million, thirty-one thousand, nine hundred one".