129275227 has 4 divisors (see below), whose sum is σ = 131204776. Its totient is φ = 127345680.

The previous prime is 129275171. The next prime is 129275233. The reversal of 129275227 is 722572921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 722572921 = 7 ⋅103224703.

It is a cyclic number.

It is not a de Polignac number, because 129275227 - 2¹⁵ = 129242459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129275257) 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, 964674 + ... + 964807.

It is an arithmetic number, because the mean of its divisors is an integer number (32801194).

Almost surely, 2^129275227 is an apocalyptic number.

129275227 is a deficient number, since it is larger than the sum of its proper divisors (1929549).

129275227 is an equidigital number, since it uses as much as digits as its factorization.

129275227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1929548.

The product of its digits is 35280, while the sum is 37.

The square root of 129275227 is about 11369.9264289616. The cubic root of 129275227 is about 505.6365231149.

The spelling of 129275227 in words is "one hundred twenty-nine million, two hundred seventy-five thousand, two hundred twenty-seven".