51646533 has 4 divisors (see below), whose sum is σ = 68862048. Its totient is φ = 34431020.

The previous prime is 51646499. The next prime is 51646549. The reversal of 51646533 is 33564615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51646533 - 2¹³ = 51638341 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51646494 and 51646503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51646733) 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, 8607753 + ... + 8607758.

It is an arithmetic number, because the mean of its divisors is an integer number (17215512).

Almost surely, 2^51646533 is an apocalyptic number.

It is an amenable number.

51646533 is a deficient number, since it is larger than the sum of its proper divisors (17215515).

51646533 is a wasteful number, since it uses less digits than its factorization.

51646533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17215514.

The product of its digits is 32400, while the sum is 33.

The square root of 51646533 is about 7186.5522331644. The cubic root of 51646533 is about 372.4034745317.

The spelling of 51646533 in words is "fifty-one million, six hundred forty-six thousand, five hundred thirty-three".