129977331 has 8 divisors (see below), whose sum is σ = 189057984. Its totient is φ = 78774120.

The previous prime is 129977329. The next prime is 129977369. The reversal of 129977331 is 133779921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 129977331 - 2¹ = 129977329 is a prime.

It is a super-2 number, since 2×129977331² = 33788213147767122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (129977311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1969321 + ... + 1969386.

It is an arithmetic number, because the mean of its divisors is an integer number (23632248).

Almost surely, 2^129977331 is an apocalyptic number.

129977331 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

129977331 is a deficient number, since it is larger than the sum of its proper divisors (59080653).

129977331 is a wasteful number, since it uses less digits than its factorization.

129977331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3938721.

The product of its digits is 71442, while the sum is 42.

The square root of 129977331 is about 11400.7601062385. The cubic root of 129977331 is about 506.5502549285.

The spelling of 129977331 in words is "one hundred twenty-nine million, nine hundred seventy-seven thousand, three hundred thirty-one".