90136939 has 2 divisors, whose sum is σ = 90136940. Its totient is φ = 90136938.

The previous prime is 90136903. The next prime is 90136951. The reversal of 90136939 is 93963109.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90136939 - 2⁷ = 90136811 is a prime.

It is not a weakly prime, because it can be changed into another prime (90136999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45068469 + 45068470.

It is an arithmetic number, because the mean of its divisors is an integer number (45068470).

Almost surely, 2^90136939 is an apocalyptic number.

90136939 is a deficient number, since it is larger than the sum of its proper divisors (1).

90136939 is an equidigital number, since it uses as much as digits as its factorization.

90136939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39366, while the sum is 40.

The square root of 90136939 is about 9494.0475562323. The cubic root of 90136939 is about 448.3676480264.

The spelling of 90136939 in words is "ninety million, one hundred thirty-six thousand, nine hundred thirty-nine".