2190561 has 4 divisors (see below), whose sum is σ = 2920752. Its totient is φ = 1460372.

The previous prime is 2190541. The next prime is 2190577. The reversal of 2190561 is 1650912.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2190561 is a prime.

It is a D-number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (2190521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 365091 + ... + 365096.

It is an arithmetic number, because the mean of its divisors is an integer number (730188).

2^2190561 is an apocalyptic number.

It is an amenable number.

2190561 is a deficient number, since it is larger than the sum of its proper divisors (730191).

2190561 is an equidigital number, since it uses as much as digits as its factorization.

2190561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730190.

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 2190561 is about 1480.0543908924. The cubic root of 2190561 is about 129.8728737521.

The spelling of 2190561 in words is "two million, one hundred ninety thousand, five hundred sixty-one".