51245129 has 4 divisors (see below), whose sum is σ = 55187076. Its totient is φ = 47303184.

The previous prime is 51245107. The next prime is 51245141. The reversal of 51245129 is 92154215.

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 25000000 + 26245129 = 5000^2 + 5123^2 .

It is a cyclic number.

It is not a de Polignac number, because 51245129 - 2⁸ = 51244873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51245149) 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, 1970954 + ... + 1970979.

It is an arithmetic number, because the mean of its divisors is an integer number (13796769).

Almost surely, 2^51245129 is an apocalyptic number.

It is an amenable number.

51245129 is a deficient number, since it is larger than the sum of its proper divisors (3941947).

51245129 is a wasteful number, since it uses less digits than its factorization.

51245129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3941946.

The product of its digits is 3600, while the sum is 29.

The square root of 51245129 is about 7158.5703181571. The cubic root of 51245129 is about 371.4361737455.

The spelling of 51245129 in words is "fifty-one million, two hundred forty-five thousand, one hundred twenty-nine".