121972159 has 2 divisors, whose sum is σ = 121972160. Its totient is φ = 121972158.

The previous prime is 121972111. The next prime is 121972177. The reversal of 121972159 is 951279121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121972159 - 2¹⁹ = 121447871 is a prime.

It is a super-2 number, since 2×121972159² = 29754415142242562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121972759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60986079 + 60986080.

It is an arithmetic number, because the mean of its divisors is an integer number (60986080).

Almost surely, 2^121972159 is an apocalyptic number.

121972159 is a deficient number, since it is larger than the sum of its proper divisors (1).

121972159 is an equidigital number, since it uses as much as digits as its factorization.

121972159 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 37.

The square root of 121972159 is about 11044.1006424244. The cubic root of 121972159 is about 495.9298361014.

The spelling of 121972159 in words is "one hundred twenty-one million, nine hundred seventy-two thousand, one hundred fifty-nine".