129572237 has 2 divisors, whose sum is σ = 129572238. Its totient is φ = 129572236.

The previous prime is 129572221. The next prime is 129572243. The reversal of 129572237 is 732275921.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109956196 + 19616041 = 10486^2 + 4429^2 .

It is a cyclic number.

It is not a de Polignac number, because 129572237 - 2⁴ = 129572221 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129572237.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129572207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64786118 + 64786119.

It is an arithmetic number, because the mean of its divisors is an integer number (64786119).

Almost surely, 2^129572237 is an apocalyptic number.

It is an amenable number.

129572237 is a deficient number, since it is larger than the sum of its proper divisors (1).

129572237 is an equidigital number, since it uses as much as digits as its factorization.

129572237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 38.

The square root of 129572237 is about 11382.9801458142. The cubic root of 129572237 is about 506.0234604567.

The spelling of 129572237 in words is "one hundred twenty-nine million, five hundred seventy-two thousand, two hundred thirty-seven".