90409561813 has 16 divisors (see below), whose sum is σ = 93935174400. Its totient is φ = 86911997760.

The previous prime is 90409561793. The next prime is 90409561889. The reversal of 90409561813 is 31816590409.

It is a de Polignac number, because none of the positive numbers 2^k-90409561813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90409561213) 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 in 15 ways as a sum of consecutive naturals, for example, 6378228 + ... + 6392386.

It is an arithmetic number, because the mean of its divisors is an integer number (5870948400).

Almost surely, 2^90409561813 is an apocalyptic number.

It is an amenable number.

90409561813 is a deficient number, since it is larger than the sum of its proper divisors (3525612587).

90409561813 is a wasteful number, since it uses less digits than its factorization.

90409561813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15132.

The product of its (nonzero) digits is 233280, while the sum is 46.

The spelling of 90409561813 in words is "ninety billion, four hundred nine million, five hundred sixty-one thousand, eight hundred thirteen".