51920186 has 16 divisors (see below), whose sum is σ = 80089128. Its totient is φ = 25228800.

The previous prime is 51920173. The next prime is 51920189. The reversal of 51920186 is 68102915.

51920186 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 46308025 + 5612161 = 6805^2 + 2369^2 .

It is not an unprimeable number, because it can be changed into a prime (51920189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22946 + ... + 25106.

Almost surely, 2^51920186 is an apocalyptic number.

51920186 is a deficient number, since it is larger than the sum of its proper divisors (28168942).

51920186 is a wasteful number, since it uses less digits than its factorization.

51920186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2497.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 51920186 is about 7205.5663205608. The cubic root of 51920186 is about 373.0600520965.

The spelling of 51920186 in words is "fifty-one million, nine hundred twenty thousand, one hundred eighty-six".