51353521 has 12 divisors (see below), whose sum is σ = 53763996. Its totient is φ = 49014720.

The previous prime is 51353513. The next prime is 51353537. The reversal of 51353521 is 12535315.

It can be written as a sum of positive squares in 6 ways, for example, as 6195121 + 45158400 = 2489^2 + 6720^2 .

It is not a de Polignac number, because 51353521 - 2³ = 51353513 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 (51353581) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 137491 + ... + 137863.

It is an arithmetic number, because the mean of its divisors is an integer number (4480333).

Almost surely, 2^51353521 is an apocalyptic number.

It is an amenable number.

51353521 is a deficient number, since it is larger than the sum of its proper divisors (2410475).

51353521 is an equidigital number, since it uses as much as digits as its factorization.

51353521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532 (or 471 counting only the distinct ones).

The product of its digits is 2250, while the sum is 25.

The square root of 51353521 is about 7166.1371044657. The cubic root of 51353521 is about 371.6978724851.

Adding to 51353521 its reverse (12535315), we get a palindrome (63888836).

The spelling of 51353521 in words is "fifty-one million, three hundred fifty-three thousand, five hundred twenty-one".