129254161 has 3 divisors (see below), whose sum is σ = 129265531. Its totient is φ = 129242792.

The previous prime is 129254143. The next prime is 129254201. The reversal of 129254161 is 161452921.

The square root of 129254161 is 11369.

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, and also an emirpimes, since its reverse is a distinct semiprime: 161452921 = 7 ⋅23064703.

It can be written as a sum of positive squares in only one way, i.e., 74494161 + 54760000 = 8631^2 + 7400^2 .

It is not a de Polignac number, because 129254161 - 2¹⁷ = 129123089 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129254101) 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, 5685 + ... + 17053.

Almost surely, 2^129254161 is an apocalyptic number.

129254161 is the 11369-th square number.

129254161 is the 5685-th centered octagonal number.

It is an amenable number.

129254161 is a deficient number, since it is larger than the sum of its proper divisors (11370).

129254161 is an frugal number, since it uses more digits than its factorization.

129254161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22738 (or 11369 counting only the distinct ones).

The product of its digits is 4320, while the sum is 31.

The cubic root of 129254161 is about 505.6090563479.

The spelling of 129254161 in words is "one hundred twenty-nine million, two hundred fifty-four thousand, one hundred sixty-one".