1223544531 has 16 divisors (see below), whose sum is σ = 1786048128. Its totient is φ = 738897600.

The previous prime is 1223544529. The next prime is 1223544533. The reversal of 1223544531 is 1354453221.

It is an interprime number because it is at equal distance from previous prime (1223544529) and next prime (1223544533).

It is not a de Polignac number, because 1223544531 - 2¹ = 1223544529 is a prime.

It is a super-2 number, since 2×1223544531² = 2994122438680019922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1223544533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56701 + ... + 75246.

It is an arithmetic number, because the mean of its divisors is an integer number (111628008).

Almost surely, 2^1223544531 is an apocalyptic number.

1223544531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1223544531 is a deficient number, since it is larger than the sum of its proper divisors (562503597).

1223544531 is a wasteful number, since it uses less digits than its factorization.

1223544531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132242.

The product of its digits is 14400, while the sum is 30.

The square root of 1223544531 is about 34979.2014059784. The cubic root of 1223544531 is about 1069.5635483769.

Adding to 1223544531 its reverse (1354453221), we get a palindrome (2577997752).

The spelling of 1223544531 in words is "one billion, two hundred twenty-three million, five hundred forty-four thousand, five hundred thirty-one".