1219661 has 4 divisors (see below), whose sum is σ = 1222524. Its totient is φ = 1216800.

The previous prime is 1219657. The next prime is 1219663. The reversal of 1219661 is 1669121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 570025 + 649636 = 755^2 + 806^2 .

It is a cyclic number.

It is not a de Polignac number, because 1219661 - 2² = 1219657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1219661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1219663) 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, 650 + ... + 1691.

It is an arithmetic number, because the mean of its divisors is an integer number (305631).

2^1219661 is an apocalyptic number.

It is an amenable number.

1219661 is a deficient number, since it is larger than the sum of its proper divisors (2863).

1219661 is an equidigital number, since it uses as much as digits as its factorization.

1219661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2862.

The product of its digits is 648, while the sum is 26.

The square root of 1219661 is about 1104.3826329674. The cubic root of 1219661 is about 106.8430750604.

The spelling of 1219661 in words is "one million, two hundred nineteen thousand, six hundred sixty-one".