2181469 has 2 divisors, whose sum is σ = 2181470. Its totient is φ = 2181468.

The previous prime is 2181463. The next prime is 2181503. The reversal of 2181469 is 9641812.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1996569 + 184900 = 1413^2 + 430^2 .

It is a cyclic number.

It is not a de Polignac number, because 2181469 - 2³ = 2181461 is a prime.

It is a super-2 number, since 2×2181469² = 9517613995922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2181469.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2181461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090734 + 1090735.

It is an arithmetic number, because the mean of its divisors is an integer number (1090735).

2^2181469 is an apocalyptic number.

It is an amenable number.

2181469 is a deficient number, since it is larger than the sum of its proper divisors (1).

2181469 is an equidigital number, since it uses as much as digits as its factorization.

2181469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 31.

The square root of 2181469 is about 1476.9796884182. The cubic root of 2181469 is about 129.6929439530.

The spelling of 2181469 in words is "two million, one hundred eighty-one thousand, four hundred sixty-nine".