51520569 has 4 divisors (see below), whose sum is σ = 68694096. Its totient is φ = 34347044.

The previous prime is 51520499. The next prime is 51520583. The reversal of 51520569 is 96502515.

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 a cyclic number.

It is not a de Polignac number, because 51520569 - 2¹² = 51516473 is a prime.

It is a super-2 number, since 2×51520569² = 5308738060167522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51525569) 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, 8586759 + ... + 8586764.

It is an arithmetic number, because the mean of its divisors is an integer number (17173524).

Almost surely, 2^51520569 is an apocalyptic number.

It is an amenable number.

51520569 is a deficient number, since it is larger than the sum of its proper divisors (17173527).

51520569 is a wasteful number, since it uses less digits than its factorization.

51520569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17173526.

The product of its (nonzero) digits is 13500, while the sum is 33.

The square root of 51520569 is about 7177.7830142740. The cubic root of 51520569 is about 372.1004685854.

The spelling of 51520569 in words is "fifty-one million, five hundred twenty thousand, five hundred sixty-nine".