51949894 has 4 divisors (see below), whose sum is σ = 77924844. Its totient is φ = 25974946.

The previous prime is 51949883. The next prime is 51949897. The reversal of 51949894 is 49894915.

It is a happy number.

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

It is a super-2 number, since 2×51949894² = 5397582973222472, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51949897) 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 as a sum of consecutive naturals, namely, 12987472 + ... + 12987475.

It is an arithmetic number, because the mean of its divisors is an integer number (19481211).

Almost surely, 2^51949894 is an apocalyptic number.

51949894 is a deficient number, since it is larger than the sum of its proper divisors (25974950).

51949894 is a wasteful number, since it uses less digits than its factorization.

51949894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25974949.

The product of its digits is 466560, while the sum is 49.

The square root of 51949894 is about 7207.6274875995. The cubic root of 51949894 is about 373.1311917676.

The spelling of 51949894 in words is "fifty-one million, nine hundred forty-nine thousand, eight hundred ninety-four".