129093731 has 4 divisors (see below), whose sum is σ = 139024032. Its totient is φ = 119163432.

The previous prime is 129093683. The next prime is 129093737. The reversal of 129093731 is 137390921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 137390921 = 3301 ⋅41621.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129093731 is a prime.

It is a super-2 number, since 2×129093731² = 33330382767000722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129093691 and 129093700.

It is not an unprimeable number, because it can be changed into a prime (129093737) 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, 4965131 + ... + 4965156.

It is an arithmetic number, because the mean of its divisors is an integer number (34756008).

Almost surely, 2^129093731 is an apocalyptic number.

129093731 is a deficient number, since it is larger than the sum of its proper divisors (9930301).

129093731 is an equidigital number, since it uses as much as digits as its factorization.

129093731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9930300.

The product of its (nonzero) digits is 10206, while the sum is 35.

The square root of 129093731 is about 11361.9422195327. The cubic root of 129093731 is about 505.3997827655.

The spelling of 129093731 in words is "one hundred twenty-nine million, ninety-three thousand, seven hundred thirty-one".