51813191 has 2 divisors, whose sum is σ = 51813192. Its totient is φ = 51813190.

The previous prime is 51813187. The next prime is 51813199. The reversal of 51813191 is 19131815.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51813191 - 2² = 51813187 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51813199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25906595 + 25906596.

It is an arithmetic number, because the mean of its divisors is an integer number (25906596).

Almost surely, 2^51813191 is an apocalyptic number.

51813191 is a deficient number, since it is larger than the sum of its proper divisors (1).

51813191 is an equidigital number, since it uses as much as digits as its factorization.

51813191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 29.

The square root of 51813191 is about 7198.1380231279. The cubic root of 51813191 is about 372.8036135538.

The spelling of 51813191 in words is "fifty-one million, eight hundred thirteen thousand, one hundred ninety-one".