129057 has 4 divisors (see below), whose sum is σ = 172080. Its totient is φ = 86036.

The previous prime is 129049. The next prime is 129061. The reversal of 129057 is 750921.

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, and also an emirpimes, since its reverse is a distinct semiprime: 750921 = 3 ⋅250307.

It is a cyclic number.

It is not a de Polignac number, because 129057 - 2³ = 129049 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (129037) 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, 21507 + ... + 21512.

It is an arithmetic number, because the mean of its divisors is an integer number (43020).

2¹²⁹⁰⁵⁷ is an apocalyptic number.

It is an amenable number.

129057 is a deficient number, since it is larger than the sum of its proper divisors (43023).

129057 is an equidigital number, since it uses as much as digits as its factorization.

129057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43022.

The product of its (nonzero) digits is 630, while the sum is 24.

The square root of 129057 is about 359.2450417194. The cubic root of 129057 is about 50.5351844470.

Adding to 129057 its reverse (750921), we get a palindrome (879978).

The spelling of 129057 in words is "one hundred twenty-nine thousand, fifty-seven".