51994 has 4 divisors (see below), whose sum is σ = 77994. Its totient is φ = 25996.

The previous prime is 51991. The next prime is 52009. The reversal of 51994 is 49915.

51994 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 50625 + 1369 = 225^2 + 37^2 .

It is not an unprimeable number, because it can be changed into a prime (51991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12997 + ... + 13000.

2⁵¹⁹⁹⁴ is an apocalyptic number.

51994 is a deficient number, since it is larger than the sum of its proper divisors (26000).

51994 is a wasteful number, since it uses less digits than its factorization.

51994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25999.

The product of its digits is 1620, while the sum is 28.

The square root of 51994 is about 228.0219287700. The cubic root of 51994 is about 37.3236759317.

The spelling of 51994 in words is "fifty-one thousand, nine hundred ninety-four".