51997111 has 2 divisors, whose sum is σ = 51997112. Its totient is φ = 51997110.

The previous prime is 51997073. The next prime is 51997139. The reversal of 51997111 is 11179915.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51997111 - 2⁹ = 51996599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51997151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25998555 + 25998556.

It is an arithmetic number, because the mean of its divisors is an integer number (25998556).

Almost surely, 2^51997111 is an apocalyptic number.

51997111 is a deficient number, since it is larger than the sum of its proper divisors (1).

51997111 is an equidigital number, since it uses as much as digits as its factorization.

51997111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2835, while the sum is 34.

The square root of 51997111 is about 7210.9022320373. The cubic root of 51997111 is about 373.2442032302.

The spelling of 51997111 in words is "fifty-one million, nine hundred ninety-seven thousand, one hundred eleven".