51165839 has 2 divisors, whose sum is σ = 51165840. Its totient is φ = 51165838.

The previous prime is 51165817. The next prime is 51165853. The reversal of 51165839 is 93856115.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51165839 - 2¹⁶ = 51100303 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51165859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25582919 + 25582920.

It is an arithmetic number, because the mean of its divisors is an integer number (25582920).

Almost surely, 2^51165839 is an apocalyptic number.

51165839 is a deficient number, since it is larger than the sum of its proper divisors (1).

51165839 is an equidigital number, since it uses as much as digits as its factorization.

51165839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 38.

The square root of 51165839 is about 7153.0300572555. The cubic root of 51165839 is about 371.2445042965.

The spelling of 51165839 in words is "fifty-one million, one hundred sixty-five thousand, eight hundred thirty-nine".