90404131 has 2 divisors, whose sum is σ = 90404132. Its totient is φ = 90404130.

The previous prime is 90404117. The next prime is 90404137. The reversal of 90404131 is 13140409.

It is a strong prime.

It is an emirp because it is prime and its reverse (13140409) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90404131 - 2¹¹ = 90402083 is a prime.

It is a super-2 number, since 2×90404131² = 16345813803730322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (90404137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45202065 + 45202066.

It is an arithmetic number, because the mean of its divisors is an integer number (45202066).

Almost surely, 2^90404131 is an apocalyptic number.

90404131 is a deficient number, since it is larger than the sum of its proper divisors (1).

90404131 is an equidigital number, since it uses as much as digits as its factorization.

90404131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 90404131 is about 9508.1086973173. The cubic root of 90404131 is about 448.8102415227.

The spelling of 90404131 in words is "ninety million, four hundred four thousand, one hundred thirty-one".