126512129 has 4 divisors (see below), whose sum is σ = 126543876. Its totient is φ = 126480384.

The previous prime is 126512117. The next prime is 126512161. The reversal of 126512129 is 921215621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 97911025 + 28601104 = 9895^2 + 5348^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126512129 is a prime.

It is a super-2 number, since 2×126512129² = 32010637568225282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126512189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8864 + ... + 18209.

It is an arithmetic number, because the mean of its divisors is an integer number (31635969).

Almost surely, 2^126512129 is an apocalyptic number.

It is an amenable number.

126512129 is a deficient number, since it is larger than the sum of its proper divisors (31747).

126512129 is an equidigital number, since it uses as much as digits as its factorization.

126512129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31746.

The product of its digits is 2160, while the sum is 29.

The square root of 126512129 is about 11247.7610660967. The cubic root of 126512129 is about 502.0080963018.

The spelling of 126512129 in words is "one hundred twenty-six million, five hundred twelve thousand, one hundred twenty-nine".