51695869 has 4 divisors (see below), whose sum is σ = 51966720. Its totient is φ = 51425020.

The previous prime is 51695867. The next prime is 51695887. The reversal of 51695869 is 96859615.

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 51695869 - 2¹ = 51695867 is a prime.

It is a super-2 number, since 2×51695869² = 5344925743330322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51695863) 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, 135139 + ... + 135520.

It is an arithmetic number, because the mean of its divisors is an integer number (12991680).

Almost surely, 2^51695869 is an apocalyptic number.

It is an amenable number.

51695869 is a deficient number, since it is larger than the sum of its proper divisors (270851).

51695869 is a wasteful number, since it uses less digits than its factorization.

51695869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270850.

The product of its digits is 583200, while the sum is 49.

The square root of 51695869 is about 7189.9839360043. The cubic root of 51695869 is about 372.5220178268.

The spelling of 51695869 in words is "fifty-one million, six hundred ninety-five thousand, eight hundred sixty-nine".