51457247 has 2 divisors, whose sum is σ = 51457248. Its totient is φ = 51457246.

The previous prime is 51457243. The next prime is 51457271. The reversal of 51457247 is 74275415.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51457247 - 2² = 51457243 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 (51457243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25728623 + 25728624.

It is an arithmetic number, because the mean of its divisors is an integer number (25728624).

Almost surely, 2^51457247 is an apocalyptic number.

51457247 is a deficient number, since it is larger than the sum of its proper divisors (1).

51457247 is an equidigital number, since it uses as much as digits as its factorization.

51457247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39200, while the sum is 35.

The square root of 51457247 is about 7173.3706860861. The cubic root of 51457247 is about 371.9479611756.

The spelling of 51457247 in words is "fifty-one million, four hundred fifty-seven thousand, two hundred forty-seven".