2191701 has 4 divisors (see below), whose sum is σ = 2922272. Its totient is φ = 1461132.

The previous prime is 2191687. The next prime is 2191703. The reversal of 2191701 is 1071912.

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 not a de Polignac number, because 2191701 - 2¹³ = 2183509 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191703) 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, 365281 + ... + 365286.

It is an arithmetic number, because the mean of its divisors is an integer number (730568).

2^2191701 is an apocalyptic number.

It is an amenable number.

2191701 is a deficient number, since it is larger than the sum of its proper divisors (730571).

2191701 is an equidigital number, since it uses as much as digits as its factorization.

2191701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730570.

The product of its (nonzero) digits is 126, while the sum is 21.

The square root of 2191701 is about 1480.4394617815. The cubic root of 2191701 is about 129.8953990931.

The spelling of 2191701 in words is "two million, one hundred ninety-one thousand, seven hundred one".