129000057 has 4 divisors (see below), whose sum is σ = 172000080. Its totient is φ = 86000036.

The previous prime is 129000049. The next prime is 129000103. The reversal of 129000057 is 750000921.

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 129000057 - 2³ = 129000049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129000017) 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, 21500007 + ... + 21500012.

It is an arithmetic number, because the mean of its divisors is an integer number (43000020).

Almost surely, 2^129000057 is an apocalyptic number.

It is an amenable number.

129000057 is a deficient number, since it is larger than the sum of its proper divisors (43000023).

129000057 is an equidigital number, since it uses as much as digits as its factorization.

129000057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43000022.

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

The square root of 129000057 is about 11357.8192008854. The cubic root of 129000057 is about 505.2775091416.

Adding to 129000057 its reverse (750000921), we get a palindrome (879000978).

The spelling of 129000057 in words is "one hundred twenty-nine million, fifty-seven", and thus it is an aban number.