129962281 has 4 divisors (see below), whose sum is σ = 130229632. Its totient is φ = 129694932.

The previous prime is 129962237. The next prime is 129962291. The reversal of 129962281 is 182269921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 129962281 - 2⁷ = 129962153 is a prime.

It is a super-2 number, since 2×129962281² = 33780388965445922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129962221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132945 + ... + 133918.

It is an arithmetic number, because the mean of its divisors is an integer number (32557408).

Almost surely, 2^129962281 is an apocalyptic number.

It is an amenable number.

129962281 is a deficient number, since it is larger than the sum of its proper divisors (267351).

129962281 is an equidigital number, since it uses as much as digits as its factorization.

129962281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267350.

The product of its digits is 31104, while the sum is 40.

The square root of 129962281 is about 11400.1000434207. The cubic root of 129962281 is about 506.5307031201.

The spelling of 129962281 in words is "one hundred twenty-nine million, nine hundred sixty-two thousand, two hundred eighty-one".