90259999 has 2 divisors, whose sum is σ = 90260000. Its totient is φ = 90259998.

The previous prime is 90259979. The next prime is 90260011. The reversal of 90259999 is 99995209.

It is a strong prime.

It is an emirp because it is prime and its reverse (99995209) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90259999 - 2⁹ = 90259487 is a prime.

90259999 is a modest number, since divided by 9999 gives 9025 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90259969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45129999 + 45130000.

It is an arithmetic number, because the mean of its divisors is an integer number (45130000).

Almost surely, 2^90259999 is an apocalyptic number.

90259999 is a deficient number, since it is larger than the sum of its proper divisors (1).

90259999 is an equidigital number, since it uses as much as digits as its factorization.

90259999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 590490, while the sum is 52.

The square root of 90259999 is about 9500.5262485822. The cubic root of 90259999 is about 448.5716007845.

The spelling of 90259999 in words is "ninety million, two hundred fifty-nine thousand, nine hundred ninety-nine".