129899251 has 2 divisors, whose sum is σ = 129899252. Its totient is φ = 129899250.

The previous prime is 129899249. The next prime is 129899279. The reversal of 129899251 is 152998921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129899251 - 2¹ = 129899249 is a prime.

It is a super-2 number, since 2×129899251² = 33747630820722002, which contains 22 as substring.

Together with 129899249, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (129899201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64949625 + 64949626.

It is an arithmetic number, because the mean of its divisors is an integer number (64949626).

Almost surely, 2^129899251 is an apocalyptic number.

129899251 is a deficient number, since it is larger than the sum of its proper divisors (1).

129899251 is an equidigital number, since it uses as much as digits as its factorization.

129899251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 46.

The square root of 129899251 is about 11397.3352587348. The cubic root of 129899251 is about 506.4488029650.

The spelling of 129899251 in words is "one hundred twenty-nine million, eight hundred ninety-nine thousand, two hundred fifty-one".