51220533 has 40 divisors (see below), whose sum is σ = 85957088. Its totient is φ = 26968032.

The previous prime is 51220501. The next prime is 51220537. The reversal of 51220533 is 33502215.

It is not a de Polignac number, because 51220533 - 2⁵ = 51220501 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51220537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 93366 + ... + 93912.

Almost surely, 2^51220533 is an apocalyptic number.

It is an amenable number.

51220533 is a deficient number, since it is larger than the sum of its proper divisors (34736555).

51220533 is an equidigital number, since it uses as much as digits as its factorization.

51220533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591 (or 570 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 51220533 is about 7156.8521711713. The cubic root of 51220533 is about 371.3767384630.

Adding to 51220533 its reverse (33502215), we get a palindrome (84722748).

The spelling of 51220533 in words is "fifty-one million, two hundred twenty thousand, five hundred thirty-three".