2191465 has 8 divisors (see below), whose sum is σ = 2638728. Its totient is φ = 1747200.

The previous prime is 2191459. The next prime is 2191471. The reversal of 2191465 is 5641912.

It is an interprime number because it is at equal distance from previous prime (2191459) and next prime (2191471).

It can be written as a sum of positive squares in 4 ways, for example, as 1545049 + 646416 = 1243^2 + 804^2 .

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

It is not a de Polignac number, because 2191465 - 2³ = 2191457 is a prime.

It is a Duffinian number.

2191465 is a lucky number.

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, 1459 + ... + 2551.

It is an arithmetic number, because the mean of its divisors is an integer number (329841).

2^2191465 is an apocalyptic number.

It is an amenable number.

2191465 is a deficient number, since it is larger than the sum of its proper divisors (447263).

2191465 is a wasteful number, since it uses less digits than its factorization.

2191465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1499.

The product of its digits is 2160, while the sum is 28.

The square root of 2191465 is about 1480.3597535734. The cubic root of 2191465 is about 129.8907365935.

The spelling of 2191465 in words is "two million, one hundred ninety-one thousand, four hundred sixty-five".