129227961 has 16 divisors (see below), whose sum is σ = 181223424. Its totient is φ = 81751824.

The previous prime is 129227953. The next prime is 129227977. The reversal of 129227961 is 169722921.

It is not a de Polignac number, because 129227961 - 2³ = 129227953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129227921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1390 + ... + 16136.

It is an arithmetic number, because the mean of its divisors is an integer number (11326464).

Almost surely, 2^129227961 is an apocalyptic number.

It is an amenable number.

129227961 is a deficient number, since it is larger than the sum of its proper divisors (51995463).

129227961 is a wasteful number, since it uses less digits than its factorization.

129227961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14900.

The product of its digits is 27216, while the sum is 39.

The square root of 129227961 is about 11367.8476854680. The cubic root of 129227961 is about 505.5748914841.

The spelling of 129227961 in words is "one hundred twenty-nine million, two hundred twenty-seven thousand, nine hundred sixty-one".