51986191 has 2 divisors, whose sum is σ = 51986192. Its totient is φ = 51986190.

The previous prime is 51986177. The next prime is 51986203. The reversal of 51986191 is 19168915.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51986191 - 2⁵ = 51986159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51986131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25993095 + 25993096.

It is an arithmetic number, because the mean of its divisors is an integer number (25993096).

Almost surely, 2^51986191 is an apocalyptic number.

51986191 is a deficient number, since it is larger than the sum of its proper divisors (1).

51986191 is an equidigital number, since it uses as much as digits as its factorization.

51986191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 40.

The square root of 51986191 is about 7210.1450054767. The cubic root of 51986191 is about 373.2180728550.

The spelling of 51986191 in words is "fifty-one million, nine hundred eighty-six thousand, one hundred ninety-one".