51646 has 24 divisors (see below), whose sum is σ = 98496. Its totient is φ = 20160.

The previous prime is 51637. The next prime is 51647. The reversal of 51646 is 64615.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51647) by changing a digit.

51646 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1651 + ... + 1681.

It is an arithmetic number, because the mean of its divisors is an integer number (4104).

2⁵¹⁶⁴⁶ is an apocalyptic number.

51646 is a deficient number, since it is larger than the sum of its proper divisors (46850).

51646 is a wasteful number, since it uses less digits than its factorization.

51646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64 (or 57 counting only the distinct ones).

The product of its digits is 720, while the sum is 22.

The square root of 51646 is about 227.2575631305. The cubic root of 51646 is about 37.2402193441.

The spelling of 51646 in words is "fifty-one thousand, six hundred forty-six".