129397237 has 2 divisors, whose sum is σ = 129397238. Its totient is φ = 129397236.

The previous prime is 129397231. The next prime is 129397243. The reversal of 129397237 is 732793921.

It is a balanced prime because it is at equal distance from previous prime (129397231) and next prime (129397243).

It can be written as a sum of positive squares in only one way, i.e., 121022001 + 8375236 = 11001^2 + 2894^2 .

It is a cyclic number.

It is not a de Polignac number, because 129397237 - 2⁷ = 129397109 is a prime.

It is equal to p_7345978 and since 129397237 and 7345978 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 129397193 and 129397202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129397231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64698618 + 64698619.

It is an arithmetic number, because the mean of its divisors is an integer number (64698619).

Almost surely, 2^129397237 is an apocalyptic number.

It is an amenable number.

129397237 is a deficient number, since it is larger than the sum of its proper divisors (1).

129397237 is an equidigital number, since it uses as much as digits as its factorization.

129397237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 142884, while the sum is 43.

The square root of 129397237 is about 11375.2906336498. The cubic root of 129397237 is about 505.7955464000.

The spelling of 129397237 in words is "one hundred twenty-nine million, three hundred ninety-seven thousand, two hundred thirty-seven".