51513233 has 4 divisors (see below), whose sum is σ = 51889380. Its totient is φ = 51137088.

The previous prime is 51513229. The next prime is 51513257. The reversal of 51513233 is 33231515.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36084049 + 15429184 = 6007^2 + 3928^2 .

It is a cyclic number.

It is not a de Polignac number, because 51513233 - 2² = 51513229 is a prime.

It is a super-2 number, since 2×51513233² = 5307226348224578, 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 = 51513199 and 51513208.

It is not an unprimeable number, because it can be changed into a prime (51513263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187868 + ... + 188141.

It is an arithmetic number, because the mean of its divisors is an integer number (12972345).

Almost surely, 2^51513233 is an apocalyptic number.

It is an amenable number.

51513233 is a deficient number, since it is larger than the sum of its proper divisors (376147).

51513233 is a wasteful number, since it uses less digits than its factorization.

51513233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376146.

The product of its digits is 1350, while the sum is 23.

The square root of 51513233 is about 7177.2719747826. The cubic root of 51513233 is about 372.0828066517.

Adding to 51513233 its reverse (33231515), we get a palindrome (84744748).

The spelling of 51513233 in words is "fifty-one million, five hundred thirteen thousand, two hundred thirty-three".