129860831 has 4 divisors (see below), whose sum is σ = 130064064. Its totient is φ = 129657600.

The previous prime is 129860827. The next prime is 129860837. The reversal of 129860831 is 138068921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 138068921 = 2393 ⋅57697.

It is a cyclic number.

It is not a de Polignac number, because 129860831 - 2² = 129860827 is a prime.

It is a super-2 number, since 2×129860831² = 33727670856021122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129860837) 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, 100655 + ... + 101936.

It is an arithmetic number, because the mean of its divisors is an integer number (32516016).

Almost surely, 2^129860831 is an apocalyptic number.

129860831 is a deficient number, since it is larger than the sum of its proper divisors (203233).

129860831 is an equidigital number, since it uses as much as digits as its factorization.

129860831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203232.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 129860831 is about 11395.6496523893. The cubic root of 129860831 is about 506.3988676459.

The spelling of 129860831 in words is "one hundred twenty-nine million, eight hundred sixty thousand, eight hundred thirty-one".