51912317 has 2 divisors, whose sum is σ = 51912318. Its totient is φ = 51912316.

The previous prime is 51912307. The next prime is 51912319. The reversal of 51912317 is 71321915.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47045881 + 4866436 = 6859^2 + 2206^2 .

It is a cyclic number.

It is not a de Polignac number, because 51912317 - 2⁶ = 51912253 is a prime.

Together with 51912319, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51912317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51912319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25956158 + 25956159.

It is an arithmetic number, because the mean of its divisors is an integer number (25956159).

Almost surely, 2^51912317 is an apocalyptic number.

It is an amenable number.

51912317 is a deficient number, since it is larger than the sum of its proper divisors (1).

51912317 is an equidigital number, since it uses as much as digits as its factorization.

51912317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1890, while the sum is 29.

The square root of 51912317 is about 7205.0202636773. The cubic root of 51912317 is about 373.0412042064.

The spelling of 51912317 in words is "fifty-one million, nine hundred twelve thousand, three hundred seventeen".