195290197 has 4 divisors (see below), whose sum is σ = 197303596. Its totient is φ = 193276800.

The previous prime is 195290141. The next prime is 195290209. The reversal of 195290197 is 791092591.

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

It can be written as a sum of positive squares in 2 ways, for example, as 98287396 + 97002801 = 9914^2 + 9849^2 .

It is a cyclic number.

It is not a de Polignac number, because 195290197 - 2²⁷ = 61072469 is a prime.

It is a super-2 number, since 2×195290197² = 76276522088597618, 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 (195230197) 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, 1006554 + ... + 1006747.

It is an arithmetic number, because the mean of its divisors is an integer number (49325899).

Almost surely, 2^195290197 is an apocalyptic number.

It is an amenable number.

195290197 is a deficient number, since it is larger than the sum of its proper divisors (2013399).

195290197 is an equidigital number, since it uses as much as digits as its factorization.

195290197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2013398.

The product of its (nonzero) digits is 51030, while the sum is 43.

The square root of 195290197 is about 13974.6269002074. The cubic root of 195290197 is about 580.1765188050.

The spelling of 195290197 in words is "one hundred ninety-five million, two hundred ninety thousand, one hundred ninety-seven".