2191061 has 4 divisors (see below), whose sum is σ = 2306400. Its totient is φ = 2075724.

The previous prime is 2191051. The next prime is 2191067. The reversal of 2191061 is 1601912.

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 not a de Polignac number, because 2191061 - 2⁶ = 2190997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191067) 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, 57641 + ... + 57678.

It is an arithmetic number, because the mean of its divisors is an integer number (576600).

2^2191061 is an apocalyptic number.

It is an amenable number.

2191061 is a deficient number, since it is larger than the sum of its proper divisors (115339).

2191061 is a wasteful number, since it uses less digits than its factorization.

2191061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115338.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 2191061 is about 1480.2232939662. The cubic root of 2191061 is about 129.8827542495.

Adding to 2191061 its reverse (1601912), we get a palindrome (3792973).

The spelling of 2191061 in words is "two million, one hundred ninety-one thousand, sixty-one".