51817187 has 2 divisors, whose sum is σ = 51817188. Its totient is φ = 51817186.

The previous prime is 51817147. The next prime is 51817189. The reversal of 51817187 is 78171815.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51817187 - 2¹⁴ = 51800803 is a prime.

Together with 51817189, 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 51817187.

It is not a weakly prime, because it can be changed into another prime (51817189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25908593 + 25908594.

It is an arithmetic number, because the mean of its divisors is an integer number (25908594).

Almost surely, 2^51817187 is an apocalyptic number.

51817187 is a deficient number, since it is larger than the sum of its proper divisors (1).

51817187 is an equidigital number, since it uses as much as digits as its factorization.

51817187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15680, while the sum is 38.

The square root of 51817187 is about 7198.4155895586. The cubic root of 51817187 is about 372.8131972455.

The spelling of 51817187 in words is "fifty-one million, eight hundred seventeen thousand, one hundred eighty-seven".