51318157 has 6 divisors (see below), whose sum is σ = 56407694. Its totient is φ = 46652760.

The previous prime is 51318143. The next prime is 51318167. The reversal of 51318157 is 75181315.

51318157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 50965321 + 352836 = 7139^2 + 594^2 .

It is a de Polignac number, because none of the positive numbers 2^k-51318157 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 (51318167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 211938 + ... + 212179.

Almost surely, 2^51318157 is an apocalyptic number.

It is an amenable number.

51318157 is a deficient number, since it is larger than the sum of its proper divisors (5089537).

51318157 is a wasteful number, since it uses less digits than its factorization.

51318157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424139 (or 424128 counting only the distinct ones).

The product of its digits is 4200, while the sum is 31.

The square root of 51318157 is about 7163.6692413874. The cubic root of 51318157 is about 371.6125310987.

The spelling of 51318157 in words is "fifty-one million, three hundred eighteen thousand, one hundred fifty-seven".