129722755 has 8 divisors (see below), whose sum is σ = 160689024. Its totient is φ = 100430400.

The previous prime is 129722731. The next prime is 129722759. The reversal of 129722755 is 557227921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 129722755 - 2¹¹ = 129720707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129722759) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 418306 + ... + 418615.

It is an arithmetic number, because the mean of its divisors is an integer number (20086128).

Almost surely, 2^129722755 is an apocalyptic number.

129722755 is a deficient number, since it is larger than the sum of its proper divisors (30966269).

129722755 is an equidigital number, since it uses as much as digits as its factorization.

129722755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836957.

The product of its digits is 88200, while the sum is 40.

The square root of 129722755 is about 11389.5897643418. The cubic root of 129722755 is about 506.2193258862.

It can be divided in two parts, 1297227 and 55, that multiplied together give a triangular number (71347485 = T₁₁₉₄₅).

The spelling of 129722755 in words is "one hundred twenty-nine million, seven hundred twenty-two thousand, seven hundred fifty-five".