51964186 has 4 divisors (see below), whose sum is σ = 77946282. Its totient is φ = 25982092.

The previous prime is 51964147. The next prime is 51964193. The reversal of 51964186 is 68146915.

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., 50851161 + 1113025 = 7131^2 + 1055^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12991045 + ... + 12991048.

Almost surely, 2^51964186 is an apocalyptic number.

51964186 is a deficient number, since it is larger than the sum of its proper divisors (25982096).

51964186 is a wasteful number, since it uses less digits than its factorization.

51964186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25982095.

The product of its digits is 51840, while the sum is 40.

The square root of 51964186 is about 7208.6188691038. The cubic root of 51964186 is about 373.1654061591.

The spelling of 51964186 in words is "fifty-one million, nine hundred sixty-four thousand, one hundred eighty-six".