129489537 has 4 divisors (see below), whose sum is σ = 172652720. Its totient is φ = 86326356.

The previous prime is 129489533. The next prime is 129489539. The reversal of 129489537 is 735984921.

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 not a de Polignac number, because 129489537 - 2² = 129489533 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129489533) 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, 21581587 + ... + 21581592.

It is an arithmetic number, because the mean of its divisors is an integer number (43163180).

Almost surely, 2^129489537 is an apocalyptic number.

It is an amenable number.

129489537 is a deficient number, since it is larger than the sum of its proper divisors (43163183).

129489537 is an equidigital number, since it uses as much as digits as its factorization.

129489537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43163182.

The product of its digits is 544320, while the sum is 48.

The square root of 129489537 is about 11379.3469496276. The cubic root of 129489537 is about 505.9157803766.

The spelling of 129489537 in words is "one hundred twenty-nine million, four hundred eighty-nine thousand, five hundred thirty-seven".