90138457 has 2 divisors, whose sum is σ = 90138458. Its totient is φ = 90138456.

The previous prime is 90138431. The next prime is 90138469. The reversal of 90138457 is 75483109.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53523856 + 36614601 = 7316^2 + 6051^2 .

It is a cyclic number.

It is not a de Polignac number, because 90138457 - 2⁷ = 90138329 is a prime.

It is not a weakly prime, because it can be changed into another prime (90138407) 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, 45069228 + 45069229.

It is an arithmetic number, because the mean of its divisors is an integer number (45069229).

Almost surely, 2^90138457 is an apocalyptic number.

It is an amenable number.

90138457 is a deficient number, since it is larger than the sum of its proper divisors (1).

90138457 is an equidigital number, since it uses as much as digits as its factorization.

90138457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 90138457 is about 9494.1275007238. The cubic root of 90138457 is about 448.3701650051.

The spelling of 90138457 in words is "ninety million, one hundred thirty-eight thousand, four hundred fifty-seven".