121999959 has 8 divisors (see below), whose sum is σ = 180740720. Its totient is φ = 81333288.

The previous prime is 121999951. The next prime is 121999961. The reversal of 121999959 is 959999121.

It is not a de Polignac number, because 121999959 - 2³ = 121999951 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 (121999951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2259232 + ... + 2259285.

It is an arithmetic number, because the mean of its divisors is an integer number (22592590).

Almost surely, 2^121999959 is an apocalyptic number.

121999959 is a deficient number, since it is larger than the sum of its proper divisors (58740761).

121999959 is an equidigital number, since it uses as much as digits as its factorization.

121999959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4518526 (or 4518520 counting only the distinct ones).

The product of its digits is 590490, while the sum is 54.

The square root of 121999959 is about 11045.3591612043. The cubic root of 121999959 is about 495.9675108250.

The spelling of 121999959 in words is "one hundred twenty-one million, nine hundred ninety-nine thousand, nine hundred fifty-nine".