129047931 has 8 divisors (see below), whose sum is σ = 191182160. Its totient is φ = 86031936.

The previous prime is 129047923. The next prime is 129047939. The reversal of 129047931 is 139740921.

It is an interprime number because it is at equal distance from previous prime (129047923) and next prime (129047939).

It is not a de Polignac number, because 129047931 - 2³ = 129047923 is a prime.

It is a super-2 number, since 2×129047931² = 33306736990761522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129047939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2389750 + ... + 2389803.

It is an arithmetic number, because the mean of its divisors is an integer number (23897770).

Almost surely, 2^129047931 is an apocalyptic number.

129047931 is a deficient number, since it is larger than the sum of its proper divisors (62134229).

129047931 is an equidigital number, since it uses as much as digits as its factorization.

129047931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4779562 (or 4779556 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 129047931 is about 11359.9265402554. The cubic root of 129047931 is about 505.3400069530.

The spelling of 129047931 in words is "one hundred twenty-nine million, forty-seven thousand, nine hundred thirty-one".