90909090909 has 128 divisors (see below), whose sum is σ = 171943080960. Its totient is φ = 46189440000.

The previous prime is 90909090823. The next prime is 90909090929.

90909090909 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 90909090909 - 2⁷ = 90909090781 is a prime.

It is an alternating number because its digits alternate between odd and even.

90909090909 is an undulating number in base 10.

90909090909 is a modest number, since divided by 9090909 gives 909 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90909090929) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 9176859 + ... + 9186759.

It is an arithmetic number, because the mean of its divisors is an integer number (1343305320).

Almost surely, 2^90909090909 is an apocalyptic number.

It is an amenable number.

90909090909 is a deficient number, since it is larger than the sum of its proper divisors (81033990051).

90909090909 is a wasteful number, since it uses less digits than its factorization.

90909090909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10068 (or 10062 counting only the distinct ones).

The product of its (nonzero) digits is 531441, while the sum is 54.

It can be divided in two parts, 909090 and 90909, that added together give a palindrome (999999).

The spelling of 90909090909 in words is "ninety billion, nine hundred nine million, ninety thousand, nine hundred nine".