2191995 has 32 divisors (see below), whose sum is σ = 4200000. Its totient is φ = 1078272.

The previous prime is 2191993. The next prime is 2192009. The reversal of 2191995 is 5991912.

It is not a de Polignac number, because 2191995 - 2¹ = 2191993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2191993) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1131 + ... + 2379.

It is an arithmetic number, because the mean of its divisors is an integer number (131250).

2^2191995 is an apocalyptic number.

2191995 is a deficient number, since it is larger than the sum of its proper divisors (2008005).

2191995 is a wasteful number, since it uses less digits than its factorization.

2191995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1276 (or 1270 counting only the distinct ones).

The product of its digits is 7290, while the sum is 36.

The square root of 2191995 is about 1480.5387532922. The cubic root of 2191995 is about 129.9012069929.

The spelling of 2191995 in words is "two million, one hundred ninety-one thousand, nine hundred ninety-five".