129670391 has 4 divisors (see below), whose sum is σ = 130386984. Its totient is φ = 128953800.

The previous prime is 129670381. The next prime is 129670399. The reversal of 129670391 is 193076921.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193076921 = 349 ⋅553229.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129670391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129670399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 358025 + ... + 358386.

It is an arithmetic number, because the mean of its divisors is an integer number (32596746).

Almost surely, 2^129670391 is an apocalyptic number.

129670391 is a deficient number, since it is larger than the sum of its proper divisors (716593).

129670391 is an equidigital number, since it uses as much as digits as its factorization.

129670391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716592.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 129670391 is about 11387.2907664642. The cubic root of 129670391 is about 506.1512030749.

The spelling of 129670391 in words is "one hundred twenty-nine million, six hundred seventy thousand, three hundred ninety-one".