51386312 has 8 divisors (see below), whose sum is σ = 96349350. Its totient is φ = 25693152.

The previous prime is 51386311. The next prime is 51386327. The reversal of 51386312 is 21368315.

It can be written as a sum of positive squares in only one way, i.e., 33016516 + 18369796 = 5746^2 + 4286^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×51386312² = 5281106121922688, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51386311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3211637 + ... + 3211652.

Almost surely, 2^51386312 is an apocalyptic number.

It is an amenable number.

51386312 is a deficient number, since it is larger than the sum of its proper divisors (44963038).

51386312 is a wasteful number, since it uses less digits than its factorization.

51386312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6423295 (or 6423291 counting only the distinct ones).

The product of its digits is 4320, while the sum is 29.

The square root of 51386312 is about 7168.4246525998. The cubic root of 51386312 is about 371.7769696362.

The spelling of 51386312 in words is "fifty-one million, three hundred eighty-six thousand, three hundred twelve".