195820691 has 4 divisors (see below), whose sum is σ = 213622584. Its totient is φ = 178018800.

The previous prime is 195820661. The next prime is 195820721. The reversal of 195820691 is 196028591.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (195820661) and next prime (195820721).

It is a cyclic number.

It is not a de Polignac number, because 195820691 - 2¹⁰ = 195819667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195820601) 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, 8900930 + ... + 8900951.

It is an arithmetic number, because the mean of its divisors is an integer number (53405646).

Almost surely, 2^195820691 is an apocalyptic number.

195820691 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

195820691 is a deficient number, since it is larger than the sum of its proper divisors (17801893).

195820691 is a wasteful number, since it uses less digits than its factorization.

195820691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17801892.

The product of its (nonzero) digits is 38880, while the sum is 41.

The square root of 195820691 is about 13993.5946418352. The cubic root of 195820691 is about 580.7013819710.

The spelling of 195820691 in words is "one hundred ninety-five million, eight hundred twenty thousand, six hundred ninety-one".