51511312 has 10 divisors (see below), whose sum is σ = 99803198. Its totient is φ = 25755648.

The previous prime is 51511297. The next prime is 51511321. The reversal of 51511312 is 21311515.

It can be written as a sum of positive squares in only one way, i.e., 49617936 + 1893376 = 7044^2 + 1376^2 .

It is a super-2 number, since 2×51511312² = 5306830527922688, 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 51511312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1609713 + ... + 1609744.

Almost surely, 2^51511312 is an apocalyptic number.

It is an amenable number.

51511312 is a deficient number, since it is larger than the sum of its proper divisors (48291886).

51511312 is a wasteful number, since it uses less digits than its factorization.

51511312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3219465 (or 3219459 counting only the distinct ones).

The product of its digits is 150, while the sum is 19.

The square root of 51511312 is about 7177.1381483151. The cubic root of 51511312 is about 372.0781814327.

Adding to 51511312 its reverse (21311515), we get a palindrome (72822827).

The spelling of 51511312 in words is "fifty-one million, five hundred eleven thousand, three hundred twelve".