51213533 has 8 divisors (see below), whose sum is σ = 58977600. Its totient is φ = 43561440.

The previous prime is 51213523. The next prime is 51213583. The reversal of 51213533 is 33531215.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51213533 - 2⁸ = 51213277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51213499 and 51213508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51213523) 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, 27008 + ... + 28841.

It is an arithmetic number, because the mean of its divisors is an integer number (7372200).

Almost surely, 2^51213533 is an apocalyptic number.

It is an amenable number.

51213533 is a deficient number, since it is larger than the sum of its proper divisors (7764067).

51213533 is a wasteful number, since it uses less digits than its factorization.

51213533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55987.

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

The square root of 51213533 is about 7156.3631126432. The cubic root of 51213533 is about 371.3598197558.

Adding to 51213533 its reverse (33531215), we get a palindrome (84744748).

The spelling of 51213533 in words is "fifty-one million, two hundred thirteen thousand, five hundred thirty-three".