129572689 has 3 divisors (see below), whose sum is σ = 129584073. Its totient is φ = 129561306.

The previous prime is 129572633. The next prime is 129572699. The reversal of 129572689 is 986275921.

The square root of 129572689 is 11383.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 129572689 - 2¹¹ = 129570641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129572629) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 5692 + ... + 17074.

It is an arithmetic number, because the mean of its divisors is an integer number (43194691).

Almost surely, 2^129572689 is an apocalyptic number.

129572689 is the 11383-rd square number.

129572689 is the 5692-nd centered octagonal number.

It is an amenable number.

129572689 is a deficient number, since it is larger than the sum of its proper divisors (11384).

129572689 is an frugal number, since it uses more digits than its factorization.

129572689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22766 (or 11383 counting only the distinct ones).

The product of its digits is 544320, while the sum is 49.

The cubic root of 129572689 is about 506.0240488604.

Multiplying 129572689 by its sum of digits (49), we get a square (6349061761 = 79681²).

It can be divided in two parts, 1295 and 72689, that added together give a square (73984 = 272²).

The spelling of 129572689 in words is "one hundred twenty-nine million, five hundred seventy-two thousand, six hundred eighty-nine".