129949281 has 36 divisors (see below), whose sum is σ = 235807936. Its totient is φ = 67502160.

The previous prime is 129949273. The next prime is 129949283. The reversal of 129949281 is 182949921.

It is not a de Polignac number, because 129949281 - 2³ = 129949273 is a prime.

It is a super-2 number, since 2×129949281² = 33773631264833922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (129949283) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 901 + ... + 16146.

Almost surely, 2^129949281 is an apocalyptic number.

129949281 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

129949281 is a deficient number, since it is larger than the sum of its proper divisors (105858655).

129949281 is a wasteful number, since it uses less digits than its factorization.

129949281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17082 (or 17068 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 129949281 is about 11399.5298587266. The cubic root of 129949281 is about 506.5138132998.

The spelling of 129949281 in words is "one hundred twenty-nine million, nine hundred forty-nine thousand, two hundred eighty-one".