2161953 has 24 divisors (see below), whose sum is σ = 3369600. Its totient is φ = 1331424.

The previous prime is 2161949. The next prime is 2161963. The reversal of 2161953 is 3591612.

It is not a de Polignac number, because 2161953 - 2² = 2161949 is a prime.

2161953 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2161903) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7903 + ... + 8171.

It is an arithmetic number, because the mean of its divisors is an integer number (140400).

2^2161953 is an apocalyptic number.

It is an amenable number.

2161953 is a deficient number, since it is larger than the sum of its proper divisors (1207647).

2161953 is a wasteful number, since it uses less digits than its factorization.

2161953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341 (or 338 counting only the distinct ones).

The product of its digits is 1620, while the sum is 27.

The square root of 2161953 is about 1470.3581196430. The cubic root of 2161953 is about 129.3050290265.

The spelling of 2161953 in words is "two million, one hundred sixty-one thousand, nine hundred fifty-three".