90809539 has 2 divisors, whose sum is σ = 90809540. Its totient is φ = 90809538.

The previous prime is 90809513. The next prime is 90809549. The reversal of 90809539 is 93590809.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90809539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 90809495 and 90809504.

It is not a weakly prime, because it can be changed into another prime (90809549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45404769 + 45404770.

It is an arithmetic number, because the mean of its divisors is an integer number (45404770).

Almost surely, 2^90809539 is an apocalyptic number.

90809539 is a deficient number, since it is larger than the sum of its proper divisors (1).

90809539 is an equidigital number, since it uses as much as digits as its factorization.

90809539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 90809539 is about 9529.4039163003. The cubic root of 90809539 is about 449.4801222587.

The spelling of 90809539 in words is "ninety million, eight hundred nine thousand, five hundred thirty-nine".