51223512 has 32 divisors (see below), whose sum is σ = 132476400. Its totient is φ = 16485504.

The previous prime is 51223511. The next prime is 51223517. The reversal of 51223512 is 21532215.

It is a super-2 number, since 2×51223512² = 5247696363228288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51223511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36103 + ... + 37494.

Almost surely, 2^51223512 is an apocalyptic number.

It is an amenable number.

51223512 is an abundant number, since it is smaller than the sum of its proper divisors (81252888).

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

51223512 is a wasteful number, since it uses less digits than its factorization.

51223512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73635 (or 73631 counting only the distinct ones).

The product of its digits is 600, while the sum is 21.

The square root of 51223512 is about 7157.0602903706. The cubic root of 51223512 is about 371.3839381138.

Adding to 51223512 its reverse (21532215), we get a palindrome (72755727).

The spelling of 51223512 in words is "fifty-one million, two hundred twenty-three thousand, five hundred twelve".