129791251 has 2 divisors, whose sum is σ = 129791252. Its totient is φ = 129791250.

The previous prime is 129791239. The next prime is 129791257. The reversal of 129791251 is 152197921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129791251 - 2⁵ = 129791219 is a prime.

It is a super-2 number, since 2×129791251² = 33691537672290002, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 129791251.

It is not a weakly prime, because it can be changed into another prime (129791257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64895625 + 64895626.

It is an arithmetic number, because the mean of its divisors is an integer number (64895626).

Almost surely, 2^129791251 is an apocalyptic number.

129791251 is a deficient number, since it is larger than the sum of its proper divisors (1).

129791251 is an equidigital number, since it uses as much as digits as its factorization.

129791251 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 129791251 is about 11392.5963239290. The cubic root of 129791251 is about 506.3084079132.

The spelling of 129791251 in words is "one hundred twenty-nine million, seven hundred ninety-one thousand, two hundred fifty-one".