1231342225 has 6 divisors (see below), whose sum is σ = 1526864390. Its totient is φ = 985073760.

The previous prime is 1231342223. The next prime is 1231342241. The reversal of 1231342225 is 5222431321.

It can be written as a sum of positive squares in 3 ways, for example, as 150773841 + 1080568384 = 12279^2 + 32872^2 .

It is not a de Polignac number, because 1231342225 - 2¹ = 1231342223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 49253689 = 1231342225 / (1 + 2 + 3 + 1 + 3 + 4 + 2 + 2 + 2 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 1231342225.

It is not an unprimeable number, because it can be changed into a prime (1231342223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24626820 + ... + 24626869.

Almost surely, 2^1231342225 is an apocalyptic number.

It is an amenable number.

1231342225 is a deficient number, since it is larger than the sum of its proper divisors (295522165).

1231342225 is an equidigital number, since it uses as much as digits as its factorization.

1231342225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49253699 (or 49253694 counting only the distinct ones).

The product of its digits is 2880, while the sum is 25.

The square root of 1231342225 is about 35090.4862462748. The cubic root of 1231342225 is about 1071.8308611449.

Adding to 1231342225 its reverse (5222431321), we get a palindrome (6453773546).

The spelling of 1231342225 in words is "one billion, two hundred thirty-one million, three hundred forty-two thousand, two hundred twenty-five".