1995041209 has 4 divisors (see below), whose sum is σ = 2280047104. Its totient is φ = 1710035316.

The previous prime is 1995041149. The next prime is 1995041231. The reversal of 1995041209 is 9021405991.

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 1995041209 - 2²⁹ = 1458170297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1995042209) 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, 142502937 + ... + 142502950.

It is an arithmetic number, because the mean of its divisors is an integer number (570011776).

Almost surely, 2^1995041209 is an apocalyptic number.

It is an amenable number.

1995041209 is a deficient number, since it is larger than the sum of its proper divisors (285005895).

1995041209 is an equidigital number, since it uses as much as digits as its factorization.

1995041209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285005894.

The product of its (nonzero) digits is 29160, while the sum is 40.

The square root of 1995041209 is about 44665.8841734942. The cubic root of 1995041209 is about 1258.8789072647.

The spelling of 1995041209 in words is "one billion, nine hundred ninety-five million, forty-one thousand, two hundred nine".