129402251 has 4 divisors (see below), whose sum is σ = 141166104. Its totient is φ = 117638400.

The previous prime is 129402223. The next prime is 129402307. The reversal of 129402251 is 152204921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 152204921 = 11 ⋅13836811.

It is not a de Polignac number, because 129402251 - 2¹⁰ = 129401227 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129402251.

It is not an unprimeable number, because it can be changed into a prime (129402211) 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, 5881910 + ... + 5881931.

It is an arithmetic number, because the mean of its divisors is an integer number (35291526).

Almost surely, 2^129402251 is an apocalyptic number.

129402251 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

129402251 is a deficient number, since it is larger than the sum of its proper divisors (11763853).

129402251 is a wasteful number, since it uses less digits than its factorization.

129402251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11763852.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 129402251 is about 11375.5110214882. The cubic root of 129402251 is about 505.8020793219.

The spelling of 129402251 in words is "one hundred twenty-nine million, four hundred two thousand, two hundred fifty-one".