51216757 has 2 divisors, whose sum is σ = 51216758. Its totient is φ = 51216756.

The previous prime is 51216751. The next prime is 51216833. The reversal of 51216757 is 75761215.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39866596 + 11350161 = 6314^2 + 3369^2 .

It is a cyclic number.

It is not a de Polignac number, because 51216757 - 2⁷ = 51216629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51216751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25608378 + 25608379.

It is an arithmetic number, because the mean of its divisors is an integer number (25608379).

Almost surely, 2^51216757 is an apocalyptic number.

It is an amenable number.

51216757 is a deficient number, since it is larger than the sum of its proper divisors (1).

51216757 is an equidigital number, since it uses as much as digits as its factorization.

51216757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14700, while the sum is 34.

The square root of 51216757 is about 7156.5883631798. The cubic root of 51216757 is about 371.3676122204.

The spelling of 51216757 in words is "fifty-one million, two hundred sixteen thousand, seven hundred fifty-seven".