51318257029 has 4 divisors (see below), whose sum is σ = 55265815276. Its totient is φ = 47370698784.

The previous prime is 51318257009. The next prime is 51318257093. The reversal of 51318257029 is 92075281315.

It is a happy number.

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 23624304804 + 27693952225 = 153702^2 + 166415^2 .

It is a cyclic number.

It is not a de Polignac number, because 51318257029 - 2²⁵ = 51284702597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51318257009) 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, 1973779104 + ... + 1973779129.

It is an arithmetic number, because the mean of its divisors is an integer number (13816453819).

Almost surely, 2^51318257029 is an apocalyptic number.

It is an amenable number.

51318257029 is a deficient number, since it is larger than the sum of its proper divisors (3947558247).

51318257029 is a wasteful number, since it uses less digits than its factorization.

51318257029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3947558246.

The product of its (nonzero) digits is 151200, while the sum is 43.

The spelling of 51318257029 in words is "fifty-one billion, three hundred eighteen million, two hundred fifty-seven thousand, twenty-nine".