51380129 has 4 divisors (see below), whose sum is σ = 51527700. Its totient is φ = 51232560.

The previous prime is 51380111. The next prime is 51380149. The reversal of 51380129 is 92108315.

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 34199104 + 17181025 = 5848^2 + 4145^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51380129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51380149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73262 + ... + 73959.

It is an arithmetic number, because the mean of its divisors is an integer number (12881925).

Almost surely, 2^51380129 is an apocalyptic number.

It is an amenable number.

51380129 is a deficient number, since it is larger than the sum of its proper divisors (147571).

51380129 is a wasteful number, since it uses less digits than its factorization.

51380129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147570.

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

The square root of 51380129 is about 7167.9933733228. The cubic root of 51380129 is about 371.7620578234.

The spelling of 51380129 in words is "fifty-one million, three hundred eighty thousand, one hundred twenty-nine".