51520537 has 4 divisors (see below), whose sum is σ = 51545956. Its totient is φ = 51495120.

The previous prime is 51520499. The next prime is 51520583. The reversal of 51520537 is 73502515.

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 13808656 + 37711881 = 3716^2 + 6141^2 .

It is a cyclic number.

It is not a de Polignac number, because 51520537 - 2¹⁵ = 51487769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51521537) 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, 9378 + ... + 13819.

It is an arithmetic number, because the mean of its divisors is an integer number (12886489).

Almost surely, 2^51520537 is an apocalyptic number.

It is an amenable number.

51520537 is a deficient number, since it is larger than the sum of its proper divisors (25419).

51520537 is a wasteful number, since it uses less digits than its factorization.

51520537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25418.

The product of its (nonzero) digits is 5250, while the sum is 28.

The square root of 51520537 is about 7177.7807851731. The cubic root of 51520537 is about 372.1003915468.

The spelling of 51520537 in words is "fifty-one million, five hundred twenty thousand, five hundred thirty-seven".