2190591 has 24 divisors (see below), whose sum is σ = 3539760. Its totient is φ = 1330992.

The previous prime is 2190583. The next prime is 2190593. The reversal of 2190591 is 1950912.

It is a happy number.

It is not a de Polignac number, because 2190591 - 2³ = 2190583 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2190593) 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, 27690 + ... + 27768.

It is an arithmetic number, because the mean of its divisors is an integer number (147490).

2^2190591 is an apocalyptic number.

2190591 is a deficient number, since it is larger than the sum of its proper divisors (1349169).

2190591 is an equidigital number, since it uses as much as digits as its factorization.

2190591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180 (or 95 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 27.

The square root of 2190591 is about 1480.0645256204. The cubic root of 2190591 is about 129.8734666244.

The spelling of 2190591 in words is "two million, one hundred ninety thousand, five hundred ninety-one".