51153521 has 4 divisors (see below), whose sum is σ = 51335844. Its totient is φ = 50971200.

The previous prime is 51153511. The next prime is 51153523. The reversal of 51153521 is 12535115.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21298225 + 29855296 = 4615^2 + 5464^2 .

It is a cyclic number.

It is not a de Polignac number, because 51153521 - 2⁶ = 51153457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51153523) 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 3 ways as a sum of consecutive naturals, for example, 90740 + ... + 91301.

It is an arithmetic number, because the mean of its divisors is an integer number (12833961).

Almost surely, 2^51153521 is an apocalyptic number.

It is an amenable number.

51153521 is a deficient number, since it is larger than the sum of its proper divisors (182323).

51153521 is a wasteful number, since it uses less digits than its factorization.

51153521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182322.

The product of its digits is 750, while the sum is 23.

The square root of 51153521 is about 7152.1689717176. The cubic root of 51153521 is about 371.2147099590.

Adding to 51153521 its reverse (12535115), we get a palindrome (63688636).

The spelling of 51153521 in words is "fifty-one million, one hundred fifty-three thousand, five hundred twenty-one".