51312166 has 4 divisors (see below), whose sum is σ = 76968252. Its totient is φ = 25656082.

The previous prime is 51312139. The next prime is 51312167. The reversal of 51312166 is 66121315.

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

It is a super-2 number, since 2×51312166² = 5265876759223112, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51312166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51312167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12828040 + ... + 12828043.

It is an arithmetic number, because the mean of its divisors is an integer number (19242063).

Almost surely, 2^51312166 is an apocalyptic number.

51312166 is a deficient number, since it is larger than the sum of its proper divisors (25656086).

51312166 is a wasteful number, since it uses less digits than its factorization.

51312166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25656085.

The product of its digits is 1080, while the sum is 25.

The square root of 51312166 is about 7163.2510775485. The cubic root of 51312166 is about 371.5980695680.

The spelling of 51312166 in words is "fifty-one million, three hundred twelve thousand, one hundred sixty-six".