129487031 has 8 divisors (see below), whose sum is σ = 135548928. Its totient is φ = 123543000.

The previous prime is 129487019. The next prime is 129487049. The reversal of 129487031 is 130784921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129487031 - 2⁶ = 129486967 is a prime.

It is a super-2 number, since 2×129487031² = 33533782394389922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129486982 and 129487000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129487051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27215 + ... + 31616.

It is an arithmetic number, because the mean of its divisors is an integer number (16943616).

Almost surely, 2^129487031 is an apocalyptic number.

129487031 is a deficient number, since it is larger than the sum of its proper divisors (6061897).

129487031 is an equidigital number, since it uses as much as digits as its factorization.

129487031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58933.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 129487031 is about 11379.2368373279. The cubic root of 129487031 is about 505.9125167072.

The spelling of 129487031 in words is "one hundred twenty-nine million, four hundred eighty-seven thousand, thirty-one".