2161995 has 16 divisors (see below), whose sum is σ = 3773952. Its totient is φ = 1048160.

The previous prime is 2161987. The next prime is 2162003. The reversal of 2161995 is 5991612.

It is an interprime number because it is at equal distance from previous prime (2161987) and next prime (2162003).

It is not a de Polignac number, because 2161995 - 2³ = 2161987 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6387 + ... + 6716.

It is an arithmetic number, because the mean of its divisors is an integer number (235872).

2^2161995 is an apocalyptic number.

2161995 is a deficient number, since it is larger than the sum of its proper divisors (1611957).

2161995 is a wasteful number, since it uses less digits than its factorization.

2161995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13122.

The product of its digits is 4860, while the sum is 33.

The square root of 2161995 is about 1470.3724018085. The cubic root of 2161995 is about 129.3058663522.

It can be divided in two parts, 216 and 1995, that added together give a triangular number (2211 = T₆₆).

The spelling of 2161995 in words is "two million, one hundred sixty-one thousand, nine hundred ninety-five".