2191745 has 8 divisors (see below), whose sum is σ = 2768640. Its totient is φ = 1661040.

The previous prime is 2191727. The next prime is 2191799. The reversal of 2191745 is 5471912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2191745 - 2⁸ = 2191489 is a prime.

It is a super-2 number, since 2×2191745² = 9607492290050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11441 + ... + 11630.

It is an arithmetic number, because the mean of its divisors is an integer number (346080).

2^2191745 is an apocalyptic number.

It is an amenable number.

2191745 is a deficient number, since it is larger than the sum of its proper divisors (576895).

2191745 is a wasteful number, since it uses less digits than its factorization.

2191745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23095.

The product of its digits is 2520, while the sum is 29.

The square root of 2191745 is about 1480.4543221592. The cubic root of 2191745 is about 129.8962683356.

The spelling of 2191745 in words is "two million, one hundred ninety-one thousand, seven hundred forty-five".