90389081 has 2 divisors, whose sum is σ = 90389082. Its totient is φ = 90389080.

The previous prime is 90389071. The next prime is 90389141. The reversal of 90389081 is 18098309.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72250000 + 18139081 = 8500^2 + 4259^2 .

It is a cyclic number.

It is not a de Polignac number, because 90389081 - 2¹⁰ = 90388057 is a prime.

It is a super-2 number, since 2×90389081² = 16340371928049122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (90389071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45194540 + 45194541.

It is an arithmetic number, because the mean of its divisors is an integer number (45194541).

Almost surely, 2^90389081 is an apocalyptic number.

It is an amenable number.

90389081 is a deficient number, since it is larger than the sum of its proper divisors (1).

90389081 is an equidigital number, since it uses as much as digits as its factorization.

90389081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 90389081 is about 9507.3172346356. The cubic root of 90389081 is about 448.7853349581.

The spelling of 90389081 in words is "ninety million, three hundred eighty-nine thousand, eighty-one".