129915194 has 4 divisors (see below), whose sum is σ = 194872794. Its totient is φ = 64957596.

The previous prime is 129915167. The next prime is 129915209. The reversal of 129915194 is 491519921.

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: 491519921 = 1061 ⋅463261.

It can be written as a sum of positive squares in only one way, i.e., 129846025 + 69169 = 11395^2 + 263^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32478797 + ... + 32478800.

Almost surely, 2^129915194 is an apocalyptic number.

129915194 is a deficient number, since it is larger than the sum of its proper divisors (64957600).

129915194 is an equidigital number, since it uses as much as digits as its factorization.

129915194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64957599.

The product of its digits is 29160, while the sum is 41.

The square root of 129915194 is about 11398.0346551500. The cubic root of 129915194 is about 506.4695215421.

The spelling of 129915194 in words is "one hundred twenty-nine million, nine hundred fifteen thousand, one hundred ninety-four".