51801646 has 16 divisors (see below), whose sum is σ = 85100400. Its totient is φ = 23502528.

The previous prime is 51801641. The next prime is 51801647. The reversal of 51801646 is 64610815.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51801641) 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, 15351 + ... + 18418.

It is an arithmetic number, because the mean of its divisors is an integer number (5318775).

Almost surely, 2^51801646 is an apocalyptic number.

51801646 is a deficient number, since it is larger than the sum of its proper divisors (33298754).

51801646 is a wasteful number, since it uses less digits than its factorization.

51801646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33843.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 51801646 is about 7197.3360349507. The cubic root of 51801646 is about 372.7759221664.

The spelling of 51801646 in words is "fifty-one million, eight hundred one thousand, six hundred forty-six".