51049647 has 12 divisors (see below), whose sum is σ = 80442024. Its totient is φ = 30939120.

The previous prime is 51049613. The next prime is 51049651. The reversal of 51049647 is 74694015.

51049647 is a `hidden beast` number, since 5 + 1 + 0 + 4 + 9 + 647 = 666.

It is not a de Polignac number, because 51049647 - 2¹² = 51045551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51049667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 257728 + ... + 257925.

It is an arithmetic number, because the mean of its divisors is an integer number (6703502).

Almost surely, 2^51049647 is an apocalyptic number.

51049647 is a deficient number, since it is larger than the sum of its proper divisors (29392377).

51049647 is a wasteful number, since it uses less digits than its factorization.

51049647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515670 (or 515667 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 51049647 is about 7144.9035682786. The cubic root of 51049647 is about 370.9632728105.

The spelling of 51049647 in words is "fifty-one million, forty-nine thousand, six hundred forty-seven".