129144737 has 4 divisors (see below), whose sum is σ = 129937200. Its totient is φ = 128352276.

The previous prime is 129144727. The next prime is 129144749. The reversal of 129144737 is 737441921.

It is a happy number.

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 129144737 - 2¹⁶ = 129079201 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129144737.

It is not an unprimeable number, because it can be changed into a prime (129144727) 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, 395987 + ... + 396312.

It is an arithmetic number, because the mean of its divisors is an integer number (32484300).

Almost surely, 2^129144737 is an apocalyptic number.

It is an amenable number.

129144737 is a deficient number, since it is larger than the sum of its proper divisors (792463).

129144737 is an equidigital number, since it uses as much as digits as its factorization.

129144737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792462.

The product of its digits is 42336, while the sum is 38.

The square root of 129144737 is about 11364.1865964969. The cubic root of 129144737 is about 505.4663365446.

The spelling of 129144737 in words is "one hundred twenty-nine million, one hundred forty-four thousand, seven hundred thirty-seven".