51345531 has 12 divisors (see below), whose sum is σ = 74228440. Its totient is φ = 34201440.

The previous prime is 51345521. The next prime is 51345533. The reversal of 51345531 is 13554315.

It is not a de Polignac number, because 51345531 - 2¹¹ = 51343483 is a prime.

It is a super-2 number, since 2×51345531² = 5272727107343922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51345495 and 51345504.

It is not an unprimeable number, because it can be changed into a prime (51345533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17436 + ... + 20166.

Almost surely, 2^51345531 is an apocalyptic number.

51345531 is a deficient number, since it is larger than the sum of its proper divisors (22882909).

51345531 is a wasteful number, since it uses less digits than its factorization.

51345531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4826 (or 4823 counting only the distinct ones).

The product of its digits is 4500, while the sum is 27.

The square root of 51345531 is about 7165.5795997253. The cubic root of 51345531 is about 371.6785942222.

Adding to 51345531 its reverse (13554315), we get a palindrome (64899846).

The spelling of 51345531 in words is "fifty-one million, three hundred forty-five thousand, five hundred thirty-one".