129719931 has 32 divisors (see below), whose sum is σ = 197918208. Its totient is φ = 74807040.

The previous prime is 129719927. The next prime is 129719963. The reversal of 129719931 is 139917921.

It is not a de Polignac number, because 129719931 - 2² = 129719927 is a prime.

It is a super-2 number, since 2×129719931² = 33654520997289522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (129719921) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 209935 + ... + 210551.

It is an arithmetic number, because the mean of its divisors is an integer number (6184944).

Almost surely, 2^129719931 is an apocalyptic number.

129719931 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

129719931 is a deficient number, since it is larger than the sum of its proper divisors (68198277).

129719931 is a wasteful number, since it uses less digits than its factorization.

129719931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931.

The product of its digits is 30618, while the sum is 42.

The square root of 129719931 is about 11389.4657908086. The cubic root of 129719931 is about 506.2156524784.

The spelling of 129719931 in words is "one hundred twenty-nine million, seven hundred nineteen thousand, nine hundred thirty-one".