51013533 has 4 divisors (see below), whose sum is σ = 68018048. Its totient is φ = 34009020.

The previous prime is 51013519. The next prime is 51013597. The reversal of 51013533 is 33531015.

It is a happy number.

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 not a de Polignac number, because 51013533 - 2¹⁰ = 51012509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51013513) 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, 8502253 + ... + 8502258.

It is an arithmetic number, because the mean of its divisors is an integer number (17004512).

Almost surely, 2^51013533 is an apocalyptic number.

It is an amenable number.

51013533 is a deficient number, since it is larger than the sum of its proper divisors (17004515).

51013533 is a wasteful number, since it uses less digits than its factorization.

51013533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17004514.

The product of its (nonzero) digits is 675, while the sum is 21.

The square root of 51013533 is about 7142.3758652146. The cubic root of 51013533 is about 370.8757754506.

Adding to 51013533 its reverse (33531015), we get a palindrome (84544548).

The spelling of 51013533 in words is "fifty-one million, thirteen thousand, five hundred thirty-three".