90899306879 has 2 divisors, whose sum is σ = 90899306880. Its totient is φ = 90899306878.

The previous prime is 90899306819. The next prime is 90899306923. The reversal of 90899306879 is 97860399809.

It is a strong prime.

It is an emirp because it is prime and its reverse (97860399809) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90899306879 - 2²⁰ = 90898258303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90899306819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45449653439 + 45449653440.

It is an arithmetic number, because the mean of its divisors is an integer number (45449653440).

Almost surely, 2^90899306879 is an apocalyptic number.

90899306879 is a deficient number, since it is larger than the sum of its proper divisors (1).

90899306879 is an equidigital number, since it uses as much as digits as its factorization.

90899306879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52907904, while the sum is 68.

The spelling of 90899306879 in words is "ninety billion, eight hundred ninety-nine million, three hundred six thousand, eight hundred seventy-nine".