195011997 has 4 divisors (see below), whose sum is σ = 260016000. Its totient is φ = 130007996.

The previous prime is 195011983. The next prime is 195012017. The reversal of 195011997 is 799110591.

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 not a de Polignac number, because 195011997 - 2¹⁰ = 195010973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195011197) 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, 32501997 + ... + 32502002.

It is an arithmetic number, because the mean of its divisors is an integer number (65004000).

Almost surely, 2^195011997 is an apocalyptic number.

It is an amenable number.

195011997 is a deficient number, since it is larger than the sum of its proper divisors (65004003).

195011997 is an equidigital number, since it uses as much as digits as its factorization.

195011997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65004002.

The product of its (nonzero) digits is 25515, while the sum is 42.

The square root of 195011997 is about 13964.6695986694. The cubic root of 195011997 is about 579.9008917062.

The spelling of 195011997 in words is "one hundred ninety-five million, eleven thousand, nine hundred ninety-seven".