51312757 has 2 divisors, whose sum is σ = 51312758. Its totient is φ = 51312756.

The previous prime is 51312739. The next prime is 51312761. The reversal of 51312757 is 75721315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40462321 + 10850436 = 6361^2 + 3294^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51312757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51312707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25656378 + 25656379.

It is an arithmetic number, because the mean of its divisors is an integer number (25656379).

Almost surely, 2^51312757 is an apocalyptic number.

It is an amenable number.

51312757 is a deficient number, since it is larger than the sum of its proper divisors (1).

51312757 is an equidigital number, since it uses as much as digits as its factorization.

51312757 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7350, while the sum is 31.

The square root of 51312757 is about 7163.2923296484. The cubic root of 51312757 is about 371.5994962187.

The spelling of 51312757 in words is "fifty-one million, three hundred twelve thousand, seven hundred fifty-seven".