51965857 has 2 divisors, whose sum is σ = 51965858. Its totient is φ = 51965856.

The previous prime is 51965791. The next prime is 51965861. The reversal of 51965857 is 75856915.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38489616 + 13476241 = 6204^2 + 3671^2 .

It is a cyclic number.

It is not a de Polignac number, because 51965857 - 2⁷ = 51965729 is a prime.

It is a super-3 number, since 3×51965857³ (a number of 24 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (51965897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25982928 + 25982929.

It is an arithmetic number, because the mean of its divisors is an integer number (25982929).

Almost surely, 2^51965857 is an apocalyptic number.

It is an amenable number.

51965857 is a deficient number, since it is larger than the sum of its proper divisors (1).

51965857 is an equidigital number, since it uses as much as digits as its factorization.

51965857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 378000, while the sum is 46.

The square root of 51965857 is about 7208.7347710954. The cubic root of 51965857 is about 373.1694060467.

The spelling of 51965857 in words is "fifty-one million, nine hundred sixty-five thousand, eight hundred fifty-seven".