51838191 has 16 divisors (see below), whose sum is σ = 76965120. Its totient is φ = 34483320.

The previous prime is 51838181. The next prime is 51838201. The reversal of 51838191 is 19183815.

It is an interprime number because it is at equal distance from previous prime (51838181) and next prime (51838201).

It is not a de Polignac number, because 51838191 - 2⁹ = 51837679 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51838181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12286 + ... + 15956.

It is an arithmetic number, because the mean of its divisors is an integer number (4810320).

Almost surely, 2^51838191 is an apocalyptic number.

51838191 is a deficient number, since it is larger than the sum of its proper divisors (25126929).

51838191 is a wasteful number, since it uses less digits than its factorization.

51838191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4203 (or 4197 counting only the distinct ones).

The product of its digits is 8640, while the sum is 36.

The square root of 51838191 is about 7199.8743739040. The cubic root of 51838191 is about 372.8635634853.

The spelling of 51838191 in words is "fifty-one million, eight hundred thirty-eight thousand, one hundred ninety-one".