51851417 has 2 divisors, whose sum is σ = 51851418. Its totient is φ = 51851416.

The previous prime is 51851381. The next prime is 51851419. The reversal of 51851417 is 71415815.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41165056 + 10686361 = 6416^2 + 3269^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51851417 is a prime.

Together with 51851419, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51851419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25925708 + 25925709.

It is an arithmetic number, because the mean of its divisors is an integer number (25925709).

Almost surely, 2^51851417 is an apocalyptic number.

It is an amenable number.

51851417 is a deficient number, since it is larger than the sum of its proper divisors (1).

51851417 is an equidigital number, since it uses as much as digits as its factorization.

51851417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5600, while the sum is 32.

The square root of 51851417 is about 7200.7928035738. The cubic root of 51851417 is about 372.8952716015.

The spelling of 51851417 in words is "fifty-one million, eight hundred fifty-one thousand, four hundred seventeen".