1918198195 has 4 divisors (see below), whose sum is σ = 2301837840. Its totient is φ = 1534558552.

The previous prime is 1918198159. The next prime is 1918198201. The reversal of 1918198195 is 5918918191.

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

It is a cyclic number.

It is not a de Polignac number, because 1918198195 - 2¹³ = 1918190003 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191819815 + ... + 191819824.

It is an arithmetic number, because the mean of its divisors is an integer number (575459460).

Almost surely, 2^1918198195 is an apocalyptic number.

1918198195 is a deficient number, since it is larger than the sum of its proper divisors (383639645).

1918198195 is an equidigital number, since it uses as much as digits as its factorization.

1918198195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383639644.

The product of its digits is 233280, while the sum is 52.

The square root of 1918198195 is about 43797.2395819645. The cubic root of 1918198195 is about 1242.5040871521.

The spelling of 1918198195 in words is "one billion, nine hundred eighteen million, one hundred ninety-eight thousand, one hundred ninety-five".