129143057 has 6 divisors (see below), whose sum is σ = 136298178. Its totient is φ = 122345712.

The previous prime is 129143029. The next prime is 129143099. The reversal of 129143057 is 750341921.

It can be written as a sum of positive squares in only one way, i.e., 125238481 + 3904576 = 11191^2 + 1976^2 .

It is not a de Polignac number, because 129143057 - 2²² = 124948753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129143557) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 178508 + ... + 179229.

It is an arithmetic number, because the mean of its divisors is an integer number (22716363).

Almost surely, 2^129143057 is an apocalyptic number.

It is an amenable number.

129143057 is a deficient number, since it is larger than the sum of its proper divisors (7155121).

129143057 is an equidigital number, since it uses as much as digits as its factorization.

129143057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357775 (or 357756 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 129143057 is about 11364.1126798356. The cubic root of 129143057 is about 505.4641447219.

Adding to 129143057 its reverse (750341921), we get a palindrome (879484978).

The spelling of 129143057 in words is "one hundred twenty-nine million, one hundred forty-three thousand, fifty-seven".