90131869 has 2 divisors, whose sum is σ = 90131870. Its totient is φ = 90131868.

The previous prime is 90131861. The next prime is 90131891. The reversal of 90131869 is 96813109.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85784644 + 4347225 = 9262^2 + 2085^2 .

It is a cyclic number.

It is not a de Polignac number, because 90131869 - 2³ = 90131861 is a prime.

It is a super-2 number, since 2×90131869² = 16247507618866322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90131861) 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 as a sum of consecutive naturals, namely, 45065934 + 45065935.

It is an arithmetic number, because the mean of its divisors is an integer number (45065935).

Almost surely, 2^90131869 is an apocalyptic number.

It is an amenable number.

90131869 is a deficient number, since it is larger than the sum of its proper divisors (1).

90131869 is an equidigital number, since it uses as much as digits as its factorization.

90131869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 90131869 is about 9493.7805430713. The cubic root of 90131869 is about 448.3592413116.

The spelling of 90131869 in words is "ninety million, one hundred thirty-one thousand, eight hundred sixty-nine".