1991195 has 12 divisors (see below), whose sum is σ = 2454240. Its totient is φ = 1550640.

The previous prime is 1991189. The next prime is 1991239. The reversal of 1991195 is 5911991.

It is not a de Polignac number, because 1991195 - 2⁶ = 1991131 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25166 + ... + 25244.

It is an arithmetic number, because the mean of its divisors is an integer number (204520).

2^1991195 is an apocalyptic number.

1991195 is a deficient number, since it is larger than the sum of its proper divisors (463045).

1991195 is an frugal number, since it uses more digits than its factorization.

1991195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226 (or 155 counting only the distinct ones).

The product of its digits is 3645, while the sum is 35.

The square root of 1991195 is about 1411.0970909190. The cubic root of 1991195 is about 125.8069395787.

The spelling of 1991195 in words is "one million, nine hundred ninety-one thousand, one hundred ninety-five".