1561226 has 4 divisors (see below), whose sum is σ = 2341842. Its totient is φ = 780612.

The previous prime is 1561213. The next prime is 1561243. The reversal of 1561226 is 6221651.

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

It can be written as a sum of positive squares in only one way, i.e., 1560001 + 1225 = 1249^2 + 35^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390305 + ... + 390308.

2^1561226 is an apocalyptic number.

1561226 is a deficient number, since it is larger than the sum of its proper divisors (780616).

1561226 is an equidigital number, since it uses as much as digits as its factorization.

1561226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780615.

The product of its digits is 720, while the sum is 23.

The square root of 1561226 is about 1249.4902960808. The cubic root of 1561226 is about 116.0081742159.

Adding to 1561226 its reverse (6221651), we get a palindrome (7782877).

The spelling of 1561226 in words is "one million, five hundred sixty-one thousand, two hundred twenty-six".