1223156441 has 4 divisors (see below), whose sum is σ = 1317245412. Its totient is φ = 1129067472.

The previous prime is 1223156423. The next prime is 1223156479. The reversal of 1223156441 is 1446513221.

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 761980816 + 461175625 = 27604^2 + 21475^2 .

It is not a de Polignac number, because 1223156441 - 2⁶ = 1223156377 is a prime.

It is a super-2 number, since 2×1223156441² = 2992223358319572962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1223156411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47044466 + ... + 47044491.

It is an arithmetic number, because the mean of its divisors is an integer number (329311353).

Almost surely, 2^1223156441 is an apocalyptic number.

It is an amenable number.

1223156441 is a deficient number, since it is larger than the sum of its proper divisors (94088971).

1223156441 is an equidigital number, since it uses as much as digits as its factorization.

1223156441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94088970.

The product of its digits is 5760, while the sum is 29.

The square root of 1223156441 is about 34973.6535266191. The cubic root of 1223156441 is about 1069.4504532392.

Adding to 1223156441 its reverse (1446513221), we get a palindrome (2669669662).

The spelling of 1223156441 in words is "one billion, two hundred twenty-three million, one hundred fifty-six thousand, four hundred forty-one".