51846391 has 2 divisors, whose sum is σ = 51846392. Its totient is φ = 51846390.

The previous prime is 51846373. The next prime is 51846397. The reversal of 51846391 is 19364815.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51846391 - 2⁵ = 51846359 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51846391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51846397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25923195 + 25923196.

It is an arithmetic number, because the mean of its divisors is an integer number (25923196).

Almost surely, 2^51846391 is an apocalyptic number.

51846391 is a deficient number, since it is larger than the sum of its proper divisors (1).

51846391 is an equidigital number, since it uses as much as digits as its factorization.

51846391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 37.

The square root of 51846391 is about 7200.4438057664. The cubic root of 51846391 is about 372.8832228649.

The spelling of 51846391 in words is "fifty-one million, eight hundred forty-six thousand, three hundred ninety-one".