51695899 has 4 divisors (see below), whose sum is σ = 52404136. Its totient is φ = 50987664.

The previous prime is 51695887. The next prime is 51695971. The reversal of 51695899 is 99859615.

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

It is a cyclic number.

It is not a de Polignac number, because 51695899 - 2⁵ = 51695867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51695849) 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, 354009 + ... + 354154.

It is an arithmetic number, because the mean of its divisors is an integer number (13101034).

Almost surely, 2^51695899 is an apocalyptic number.

51695899 is a deficient number, since it is larger than the sum of its proper divisors (708237).

51695899 is an equidigital number, since it uses as much as digits as its factorization.

51695899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708236.

The product of its digits is 874800, while the sum is 52.

The square root of 51695899 is about 7189.9860222395. The cubic root of 51695899 is about 372.5220898871.

The spelling of 51695899 in words is "fifty-one million, six hundred ninety-five thousand, eight hundred ninety-nine".