51787247 has 2 divisors, whose sum is σ = 51787248. Its totient is φ = 51787246.

The previous prime is 51787193. The next prime is 51787249. The reversal of 51787247 is 74278715.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51787247 - 2⁸ = 51786991 is a prime.

Together with 51787249, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51787249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25893623 + 25893624.

It is an arithmetic number, because the mean of its divisors is an integer number (25893624).

Almost surely, 2^51787247 is an apocalyptic number.

51787247 is a deficient number, since it is larger than the sum of its proper divisors (1).

51787247 is an equidigital number, since it uses as much as digits as its factorization.

51787247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 109760, while the sum is 41.

The square root of 51787247 is about 7196.3356647672. The cubic root of 51787247 is about 372.7413795194.

The spelling of 51787247 in words is "fifty-one million, seven hundred eighty-seven thousand, two hundred forty-seven".