90919181913 has 32 divisors (see below), whose sum is σ = 142338760704. Its totient is φ = 50543844672.

The previous prime is 90919181911. The next prime is 90919181917. The reversal of 90919181913 is 31918191909.

It is not a de Polignac number, because 90919181913 - 2¹ = 90919181911 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90919181911) 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 31 ways as a sum of consecutive naturals, for example, 110970 + ... + 440627.

It is an arithmetic number, because the mean of its divisors is an integer number (4448086272).

Almost surely, 2^90919181913 is an apocalyptic number.

It is an amenable number.

90919181913 is a deficient number, since it is larger than the sum of its proper divisors (51419578791).

90919181913 is a wasteful number, since it uses less digits than its factorization.

90919181913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551821.

The product of its (nonzero) digits is 157464, while the sum is 51.

The spelling of 90919181913 in words is "ninety billion, nine hundred nineteen million, one hundred eighty-one thousand, nine hundred thirteen".