51863247 has 14 divisors (see below), whose sum is σ = 77760392. Its totient is φ = 34575012.

The previous prime is 51863191. The next prime is 51863249. The reversal of 51863247 is 74236815.

51863247 is a `hidden beast` number, since 5 + 18 + 632 + 4 + 7 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-51863247 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 (51863249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 34843 + ... + 36300.

Almost surely, 2^51863247 is an apocalyptic number.

51863247 is a deficient number, since it is larger than the sum of its proper divisors (25897145).

51863247 is an frugal number, since it uses more digits than its factorization.

51863247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71161 (or 71146 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 51863247 is about 7201.6141940540. The cubic root of 51863247 is about 372.9236283682.

The spelling of 51863247 in words is "fifty-one million, eight hundred sixty-three thousand, two hundred forty-seven".