195609851 has 4 divisors (see below), whose sum is σ = 198289512. Its totient is φ = 192930192.

The previous prime is 195609847. The next prime is 195609853. The reversal of 195609851 is 158906591.

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 195609851 - 2² = 195609847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195609853) 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, 1339721 + ... + 1339866.

It is an arithmetic number, because the mean of its divisors is an integer number (49572378).

Almost surely, 2^195609851 is an apocalyptic number.

195609851 is a deficient number, since it is larger than the sum of its proper divisors (2679661).

195609851 is an equidigital number, since it uses as much as digits as its factorization.

195609851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2679660.

The product of its (nonzero) digits is 97200, while the sum is 44.

The square root of 195609851 is about 13986.0591661840. The cubic root of 195609851 is about 580.4928935371.

The spelling of 195609851 in words is "one hundred ninety-five million, six hundred nine thousand, eight hundred fifty-one".