51680194 has 16 divisors (see below), whose sum is σ = 81123768. Its totient is φ = 24665472.

The previous prime is 51680183. The next prime is 51680197. The reversal of 51680194 is 49108615.

It can be written as a sum of positive squares in 4 ways, for example, as 51652969 + 27225 = 7187^2 + 165^2 .

It is not an unprimeable number, because it can be changed into a prime (51680197) 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 7 ways as a sum of consecutive naturals, for example, 2667 + ... + 10510.

Almost surely, 2^51680194 is an apocalyptic number.

51680194 is a deficient number, since it is larger than the sum of its proper divisors (29443574).

51680194 is a wasteful number, since it uses less digits than its factorization.

51680194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13269.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 51680194 is about 7188.8937952928. The cubic root of 51680194 is about 372.4843625104.

The spelling of 51680194 in words is "fifty-one million, six hundred eighty thousand, one hundred ninety-four".