90909091579 has 2 divisors, whose sum is σ = 90909091580. Its totient is φ = 90909091578.

The previous prime is 90909091549. The next prime is 90909091601. The reversal of 90909091579 is 97519090909.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90909091579 - 2⁷ = 90909091451 is a prime.

It is not a weakly prime, because it can be changed into another prime (90909091549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45454545789 + 45454545790.

It is an arithmetic number, because the mean of its divisors is an integer number (45454545790).

Almost surely, 2^90909091579 is an apocalyptic number.

90909091579 is a deficient number, since it is larger than the sum of its proper divisors (1).

90909091579 is an equidigital number, since it uses as much as digits as its factorization.

90909091579 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2066715, while the sum is 58.

The spelling of 90909091579 in words is "ninety billion, nine hundred nine million, ninety-one thousand, five hundred seventy-nine".