51695569 has 4 divisors (see below), whose sum is σ = 53363200. Its totient is φ = 50027940.

The previous prime is 51695563. The next prime is 51695627. The reversal of 51695569 is 96559615.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-51695569 is a prime.

It is a super-2 number, since 2×51695569² = 5344863708467522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51695563) 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, 833769 + ... + 833830.

It is an arithmetic number, because the mean of its divisors is an integer number (13340800).

Almost surely, 2^51695569 is an apocalyptic number.

It is an amenable number.

51695569 is a deficient number, since it is larger than the sum of its proper divisors (1667631).

51695569 is a wasteful number, since it uses less digits than its factorization.

51695569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667630.

The product of its digits is 364500, while the sum is 46.

The square root of 51695569 is about 7189.9630736187. The cubic root of 51695569 is about 372.5212972223.

The spelling of 51695569 in words is "fifty-one million, six hundred ninety-five thousand, five hundred sixty-nine".