51817247 has 2 divisors, whose sum is σ = 51817248. Its totient is φ = 51817246.

The previous prime is 51817231. The next prime is 51817253. The reversal of 51817247 is 74271815.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51817247 - 2⁴ = 51817231 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51817217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25908623 + 25908624.

It is an arithmetic number, because the mean of its divisors is an integer number (25908624).

Almost surely, 2^51817247 is an apocalyptic number.

51817247 is a deficient number, since it is larger than the sum of its proper divisors (1).

51817247 is an equidigital number, since it uses as much as digits as its factorization.

51817247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15680, while the sum is 35.

The square root of 51817247 is about 7198.4197571411. The cubic root of 51817247 is about 372.8133411410.

The spelling of 51817247 in words is "fifty-one million, eight hundred seventeen thousand, two hundred forty-seven".