1222531231 has 16 divisors (see below), whose sum is σ = 1313625600. Its totient is φ = 1134196128.

The previous prime is 1222531229. The next prime is 1222531249. The reversal of 1222531231 is 1321352221.

It is a cyclic number.

It is not a de Polignac number, because 1222531231 - 2¹ = 1222531229 is a prime.

It is a super-2 number, since 2×1222531231² = 2989165221540750722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222531291) 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 15 ways as a sum of consecutive naturals, for example, 844150 + ... + 845596.

It is an arithmetic number, because the mean of its divisors is an integer number (82101600).

Almost surely, 2^1222531231 is an apocalyptic number.

1222531231 is a deficient number, since it is larger than the sum of its proper divisors (91094369).

1222531231 is a wasteful number, since it uses less digits than its factorization.

1222531231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2358.

The product of its digits is 720, while the sum is 22.

The square root of 1222531231 is about 34964.7140843451. The cubic root of 1222531231 is about 1069.2682075209.

Adding to 1222531231 its reverse (1321352221), we get a palindrome (2543883452).

The spelling of 1222531231 in words is "one billion, two hundred twenty-two million, five hundred thirty-one thousand, two hundred thirty-one".