51807617 has 2 divisors, whose sum is σ = 51807618. Its totient is φ = 51807616.

The previous prime is 51807611. The next prime is 51807629. The reversal of 51807617 is 71670815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45171841 + 6635776 = 6721^2 + 2576^2 .

It is a cyclic number.

It is not a de Polignac number, because 51807617 - 2²⁰ = 50759041 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51807611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25903808 + 25903809.

It is an arithmetic number, because the mean of its divisors is an integer number (25903809).

Almost surely, 2^51807617 is an apocalyptic number.

It is an amenable number.

51807617 is a deficient number, since it is larger than the sum of its proper divisors (1).

51807617 is an equidigital number, since it uses as much as digits as its factorization.

51807617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11760, while the sum is 35.

The square root of 51807617 is about 7197.7508292521. The cubic root of 51807617 is about 372.7902444881.

The spelling of 51807617 in words is "fifty-one million, eight hundred seven thousand, six hundred seventeen".