90000900131 has 2 divisors, whose sum is σ = 90000900132. Its totient is φ = 90000900130.

The previous prime is 90000899999. The next prime is 90000900151. The reversal of 90000900131 is 13100900009.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90000900131 is a prime.

It is a super-2 number, since 2×90000900131² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 90000900097 and 90000900106.

It is not a weakly prime, because it can be changed into another prime (90000900151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45000450065 + 45000450066.

It is an arithmetic number, because the mean of its divisors is an integer number (45000450066).

Almost surely, 2^90000900131 is an apocalyptic number.

90000900131 is a deficient number, since it is larger than the sum of its proper divisors (1).

90000900131 is an equidigital number, since it uses as much as digits as its factorization.

90000900131 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 spelling of 90000900131 in words is "ninety billion, nine hundred thousand, one hundred thirty-one".