51582191 has 2 divisors, whose sum is σ = 51582192. Its totient is φ = 51582190.

The previous prime is 51582187. The next prime is 51582203. The reversal of 51582191 is 19128515.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51582191 - 2² = 51582187 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51582101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25791095 + 25791096.

It is an arithmetic number, because the mean of its divisors is an integer number (25791096).

Almost surely, 2^51582191 is an apocalyptic number.

51582191 is a deficient number, since it is larger than the sum of its proper divisors (1).

51582191 is an equidigital number, since it uses as much as digits as its factorization.

51582191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3600, while the sum is 32.

The square root of 51582191 is about 7182.0742825454. The cubic root of 51582191 is about 372.2487617158.

The spelling of 51582191 in words is "fifty-one million, five hundred eighty-two thousand, one hundred ninety-one".