51391166 has 8 divisors (see below), whose sum is σ = 77649840. Its totient is φ = 25507888.

The previous prime is 51391139. The next prime is 51391199. The reversal of 51391166 is 66119315.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93506 + ... + 94053.

It is an arithmetic number, because the mean of its divisors is an integer number (9706230).

Almost surely, 2^51391166 is an apocalyptic number.

51391166 is a deficient number, since it is larger than the sum of its proper divisors (26258674).

51391166 is a wasteful number, since it uses less digits than its factorization.

51391166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187698.

The product of its digits is 4860, while the sum is 32.

The square root of 51391166 is about 7168.7632127167. The cubic root of 51391166 is about 371.7886754033.

The spelling of 51391166 in words is "fifty-one million, three hundred ninety-one thousand, one hundred sixty-six".