51256247 has 8 divisors (see below), whose sum is σ = 59684256. Its totient is φ = 43104672.

The previous prime is 51256229. The next prime is 51256277. The reversal of 51256247 is 74265215.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51256247 - 2¹² = 51252151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51256217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68708 + ... + 69449.

It is an arithmetic number, because the mean of its divisors is an integer number (7460532).

Almost surely, 2^51256247 is an apocalyptic number.

51256247 is a deficient number, since it is larger than the sum of its proper divisors (8428009).

51256247 is a wasteful number, since it uses less digits than its factorization.

51256247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138217.

The product of its digits is 16800, while the sum is 32.

The square root of 51256247 is about 7159.3468277490. The cubic root of 51256247 is about 371.4630337212.

The spelling of 51256247 in words is "fifty-one million, two hundred fifty-six thousand, two hundred forty-seven".