122659981 has 6 divisors (see below), whose sum is σ = 130300010. Its totient is φ = 115444416.

The previous prime is 122659961. The next prime is 122660003. The reversal of 122659981 is 189956221.

It can be written as a sum of positive squares in 3 ways, for example, as 37393225 + 85266756 = 6115^2 + 9234^2 .

It is not a de Polignac number, because 122659981 - 2⁵ = 122659949 is a prime.

It is a super-2 number, since 2×122659981² = 30090941877840722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122659961) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 211926 + ... + 212503.

Almost surely, 2^122659981 is an apocalyptic number.

It is an amenable number.

122659981 is a deficient number, since it is larger than the sum of its proper divisors (7640029).

122659981 is an equidigital number, since it uses as much as digits as its factorization.

122659981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424463 (or 424446 counting only the distinct ones).

The product of its digits is 77760, while the sum is 43.

The square root of 122659981 is about 11075.1966573962. The cubic root of 122659981 is about 496.8603005079.

The spelling of 122659981 in words is "one hundred twenty-two million, six hundred fifty-nine thousand, nine hundred eighty-one".