129498881 has 4 divisors (see below), whose sum is σ = 129627732. Its totient is φ = 129370032.

The previous prime is 129498857. The next prime is 129498883. The reversal of 129498881 is 188894921.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11971600 + 117527281 = 3460^2 + 10841^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129498881 is a prime.

It is a super-2 number, since 2×129498881² = 33539920360504322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129498883) 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, 62906 + ... + 64931.

It is an arithmetic number, because the mean of its divisors is an integer number (32406933).

Almost surely, 2^129498881 is an apocalyptic number.

It is an amenable number.

129498881 is a deficient number, since it is larger than the sum of its proper divisors (128851).

129498881 is a wasteful number, since it uses less digits than its factorization.

129498881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128850.

The product of its digits is 331776, while the sum is 50.

The square root of 129498881 is about 11379.7575105975. The cubic root of 129498881 is about 505.9279490904.

The spelling of 129498881 in words is "one hundred twenty-nine million, four hundred ninety-eight thousand, eight hundred eighty-one".