122890590989 has 4 divisors (see below), whose sum is σ = 122891626620. Its totient is φ = 122889555360.

The previous prime is 122890590971. The next prime is 122890590997. The reversal of 122890590989 is 989095098221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 46677602500 + 76212988489 = 216050^2 + 276067^2 .

It is a cyclic number.

It is not a de Polignac number, because 122890590989 - 2³² = 118595623693 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 (122890590919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 312752 + ... + 586169.

It is an arithmetic number, because the mean of its divisors is an integer number (30722906655).

Almost surely, 2^122890590989 is an apocalyptic number.

It is an amenable number.

122890590989 is a deficient number, since it is larger than the sum of its proper divisors (1035631).

122890590989 is an equidigital number, since it uses as much as digits as its factorization.

122890590989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1035630.

The product of its (nonzero) digits is 8398080, while the sum is 62.

The spelling of 122890590989 in words is "one hundred twenty-two billion, eight hundred ninety million, five hundred ninety thousand, nine hundred eighty-nine".