1223245531 has 4 divisors (see below), whose sum is σ = 1226327152. Its totient is φ = 1220163912.

The previous prime is 1223245519. The next prime is 1223245577. The reversal of 1223245531 is 1355423221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1355423221 = 499 ⋅2716279.

It is a cyclic number.

It is not a de Polignac number, because 1223245531 - 2¹⁵ = 1223212763 is a prime.

It is a super-2 number, since 2×1223245531² = 2992659258222943922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1223245531.

It is not an unprimeable number, because it can be changed into a prime (1223245511) 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, 1540215 + ... + 1541008.

It is an arithmetic number, because the mean of its divisors is an integer number (306581788).

Almost surely, 2^1223245531 is an apocalyptic number.

1223245531 is a deficient number, since it is larger than the sum of its proper divisors (3081621).

1223245531 is an equidigital number, since it uses as much as digits as its factorization.

1223245531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3081620.

The product of its digits is 7200, while the sum is 28.

The square root of 1223245531 is about 34974.9271764789. The cubic root of 1223245531 is about 1069.4764174916.

Adding to 1223245531 its reverse (1355423221), we get a palindrome (2578668752).

The spelling of 1223245531 in words is "one billion, two hundred twenty-three million, two hundred forty-five thousand, five hundred thirty-one".