195427109 has 4 divisors (see below), whose sum is σ = 195724320. Its totient is φ = 195129900.

The previous prime is 195427093. The next prime is 195427129. The reversal of 195427109 is 901724591.

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 not a de Polignac number, because 195427109 - 2⁴ = 195427093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195427129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 147617 + ... + 148934.

It is an arithmetic number, because the mean of its divisors is an integer number (48931080).

Almost surely, 2^195427109 is an apocalyptic number.

It is an amenable number.

195427109 is a deficient number, since it is larger than the sum of its proper divisors (297211).

195427109 is an equidigital number, since it uses as much as digits as its factorization.

195427109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297210.

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 195427109 is about 13979.5246342642. The cubic root of 195427109 is about 580.3120684866.

It can be divided in two parts, 19542710 and 9, that multiplied together give a triangular number (175884390 = T₁₈₇₅₅).

The spelling of 195427109 in words is "one hundred ninety-five million, four hundred twenty-seven thousand, one hundred nine".