51111312 has 120 divisors (see below), whose sum is σ = 158775552. Its totient is φ = 14112000.

The previous prime is 51111301. The next prime is 51111329. The reversal of 51111312 is 21311115.

It is a super-2 number, since 2×51111312² = 5224732428722688, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51111291 and 51111300.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72562 + ... + 73262.

Almost surely, 2^51111312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51111312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79387776).

51111312 is an abundant number, since it is smaller than the sum of its proper divisors (107664240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51111312 is a wasteful number, since it uses less digits than its factorization.

51111312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757 (or 744 counting only the distinct ones).

The product of its digits is 30, while the sum is 15.

The square root of 51111312 is about 7149.2175795677. The cubic root of 51111312 is about 371.1125800503.

Adding to 51111312 its reverse (21311115), we get a palindrome (72422427).

The spelling of 51111312 in words is "fifty-one million, one hundred eleven thousand, three hundred twelve".