1223505541 has 4 divisors (see below), whose sum is σ = 1223576352. Its totient is φ = 1223434732.

The previous prime is 1223505533. The next prime is 1223505581. The reversal of 1223505541 is 1455053221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1223505541 - 2³ = 1223505533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223505581) 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, 9486 + ... + 50368.

It is an arithmetic number, because the mean of its divisors is an integer number (305894088).

Almost surely, 2^1223505541 is an apocalyptic number.

It is an amenable number.

1223505541 is a deficient number, since it is larger than the sum of its proper divisors (70811).

1223505541 is an equidigital number, since it uses as much as digits as its factorization.

1223505541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70810.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 1223505541 is about 34978.6440703467. The cubic root of 1223505541 is about 1069.5521871978.

Adding to 1223505541 its reverse (1455053221), we get a palindrome (2678558762).

The spelling of 1223505541 in words is "one billion, two hundred twenty-three million, five hundred five thousand, five hundred forty-one".