51647331 has 16 divisors (see below), whose sum is σ = 71406720. Its totient is φ = 33180480.

The previous prime is 51647329. The next prime is 51647353. The reversal of 51647331 is 13374615.

It is not a de Polignac number, because 51647331 - 2¹ = 51647329 is a prime.

It is a super-2 number, since 2×51647331² = 5334893598847122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51647311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7680 + ... + 12738.

It is an arithmetic number, because the mean of its divisors is an integer number (4462920).

Almost surely, 2^51647331 is an apocalyptic number.

51647331 is a deficient number, since it is larger than the sum of its proper divisors (19759389).

51647331 is a wasteful number, since it uses less digits than its factorization.

51647331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5186.

The product of its digits is 7560, while the sum is 30.

The square root of 51647331 is about 7186.6077533145. The cubic root of 51647331 is about 372.4053925465.

The spelling of 51647331 in words is "fifty-one million, six hundred forty-seven thousand, three hundred thirty-one".