129504281 has 16 divisors (see below), whose sum is σ = 137522448. Its totient is φ = 121804800.

The previous prime is 129504259. The next prime is 129504299. The reversal of 129504281 is 182405921.

It can be written as a sum of positive squares in 8 ways, for example, as 5382400 + 124121881 = 2320^2 + 11141^2 .

It is not a de Polignac number, because 129504281 - 2¹⁸ = 129242137 is a prime.

It is a super-2 number, since 2×129504281² = 33542717594653922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129504211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132065 + ... + 133041.

It is an arithmetic number, because the mean of its divisors is an integer number (8595153).

Almost surely, 2^129504281 is an apocalyptic number.

It is an amenable number.

129504281 is a deficient number, since it is larger than the sum of its proper divisors (8018167).

129504281 is an equidigital number, since it uses as much as digits as its factorization.

129504281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 129504281 is about 11379.9947715278. The cubic root of 129504281 is about 505.9349812566.

The spelling of 129504281 in words is "one hundred twenty-nine million, five hundred four thousand, two hundred eighty-one".