129761951 has 16 divisors (see below), whose sum is σ = 144039168. Its totient is φ = 115915200.

The previous prime is 129761941. The next prime is 129761981. The reversal of 129761951 is 159167921.

It is a cyclic number.

It is not a de Polignac number, because 129761951 - 2¹⁸ = 129499807 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129761899 and 129761908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129761941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 283715 + ... + 284171.

It is an arithmetic number, because the mean of its divisors is an integer number (9002448).

Almost surely, 2^129761951 is an apocalyptic number.

129761951 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

129761951 is a deficient number, since it is larger than the sum of its proper divisors (14277217).

129761951 is a wasteful number, since it uses less digits than its factorization.

129761951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862.

The product of its digits is 34020, while the sum is 41.

The square root of 129761951 is about 11391.3103284916. The cubic root of 129761951 is about 506.2703058258.

The spelling of 129761951 in words is "one hundred twenty-nine million, seven hundred sixty-one thousand, nine hundred fifty-one".