51115847 has 2 divisors, whose sum is σ = 51115848. Its totient is φ = 51115846.

The previous prime is 51115829. The next prime is 51115873. The reversal of 51115847 is 74851115.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51115847 - 2⁶ = 51115783 is a prime.

It is a super-2 number, since 2×51115847² = 5225659629054818, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51115147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25557923 + 25557924.

It is an arithmetic number, because the mean of its divisors is an integer number (25557924).

Almost surely, 2^51115847 is an apocalyptic number.

51115847 is a deficient number, since it is larger than the sum of its proper divisors (1).

51115847 is an equidigital number, since it uses as much as digits as its factorization.

51115847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5600, while the sum is 32.

The square root of 51115847 is about 7149.5347401072. The cubic root of 51115847 is about 371.1235557405.

The spelling of 51115847 in words is "fifty-one million, one hundred fifteen thousand, eight hundred forty-seven".