129575755 has 4 divisors (see below), whose sum is σ = 155490912. Its totient is φ = 103660600.

The previous prime is 129575749. The next prime is 129575779. The reversal of 129575755 is 557575921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 557575921 = 7 ⋅79653703.

It is a de Polignac number, because none of the positive numbers 2^k-129575755 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12957571 + ... + 12957580.

It is an arithmetic number, because the mean of its divisors is an integer number (38872728).

Almost surely, 2^129575755 is an apocalyptic number.

129575755 is a deficient number, since it is larger than the sum of its proper divisors (25915157).

129575755 is an equidigital number, since it uses as much as digits as its factorization.

129575755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25915156.

The product of its digits is 551250, while the sum is 46.

The square root of 129575755 is about 11383.1346737180. The cubic root of 129575755 is about 506.0280400757.

The spelling of 129575755 in words is "one hundred twenty-nine million, five hundred seventy-five thousand, seven hundred fifty-five".