51947911 has 2 divisors, whose sum is σ = 51947912. Its totient is φ = 51947910.

The previous prime is 51947899. The next prime is 51947939. The reversal of 51947911 is 11974915.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51947911 - 2⁵ = 51947879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51947941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25973955 + 25973956.

It is an arithmetic number, because the mean of its divisors is an integer number (25973956).

Almost surely, 2^51947911 is an apocalyptic number.

51947911 is a deficient number, since it is larger than the sum of its proper divisors (1).

51947911 is an equidigital number, since it uses as much as digits as its factorization.

51947911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 37.

The square root of 51947911 is about 7207.4899236836. The cubic root of 51947911 is about 373.1264440610.

The spelling of 51947911 in words is "fifty-one million, nine hundred forty-seven thousand, nine hundred eleven".