2188161 has 8 divisors (see below), whose sum is σ = 3241760. Its totient is φ = 1458756.

The previous prime is 2188159. The next prime is 2188163. The reversal of 2188161 is 1618812.

It is an interprime number because it is at equal distance from previous prime (2188159) and next prime (2188163).

It is not a de Polignac number, because 2188161 - 2¹ = 2188159 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 81043 = 2188161 / (2 + 1 + 8 + 8 + 1 + 6 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2188163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40495 + ... + 40548.

It is an arithmetic number, because the mean of its divisors is an integer number (405220).

2^2188161 is an apocalyptic number.

It is an amenable number.

2188161 is a deficient number, since it is larger than the sum of its proper divisors (1053599).

2188161 is an equidigital number, since it uses as much as digits as its factorization.

2188161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81052 (or 81046 counting only the distinct ones).

The product of its digits is 768, while the sum is 27.

The square root of 2188161 is about 1479.2433876817. The cubic root of 2188161 is about 129.8254264242.

The spelling of 2188161 in words is "two million, one hundred eighty-eight thousand, one hundred sixty-one".