51115943 has 2 divisors, whose sum is σ = 51115944. Its totient is φ = 51115942.

The previous prime is 51115927. The next prime is 51115973. The reversal of 51115943 is 34951115.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51115943 - 2⁴ = 51115927 is a prime.

It is a super-2 number, since 2×51115943² = 5225679257558498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51115973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25557971 + 25557972.

It is an arithmetic number, because the mean of its divisors is an integer number (25557972).

Almost surely, 2^51115943 is an apocalyptic number.

51115943 is a deficient number, since it is larger than the sum of its proper divisors (1).

51115943 is an equidigital number, since it uses as much as digits as its factorization.

51115943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2700, while the sum is 29.

The square root of 51115943 is about 7149.5414538277. The cubic root of 51115943 is about 371.1237880744.

The spelling of 51115943 in words is "fifty-one million, one hundred fifteen thousand, nine hundred forty-three".