1219561 has 6 divisors (see below), whose sum is σ = 1418730. Its totient is φ = 1045296.

The previous prime is 1219549. The next prime is 1219577. The reversal of 1219561 is 1659121.

It can be written as a sum of positive squares in only one way, i.e., 648025 + 571536 = 805^2 + 756^2 .

It is not a de Polignac number, because 1219561 - 2⁷ = 1219433 is a prime.

It is a Duffinian number.

1219561 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1219501) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12396 + ... + 12493.

It is an arithmetic number, because the mean of its divisors is an integer number (236455).

2^1219561 is an apocalyptic number.

It is an amenable number.

1219561 is a deficient number, since it is larger than the sum of its proper divisors (199169).

1219561 is an equidigital number, since it uses as much as digits as its factorization.

1219561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24903 (or 24896 counting only the distinct ones).

The product of its digits is 540, while the sum is 25.

The square root of 1219561 is about 1104.3373578758. The cubic root of 1219561 is about 106.8401549595.

The spelling of 1219561 in words is "one million, two hundred nineteen thousand, five hundred sixty-one".