1231212025 has 6 divisors (see below), whose sum is σ = 1526702942. Its totient is φ = 984969600.

The previous prime is 1231211987. The next prime is 1231212049. The reversal of 1231212025 is 5202121321.

It can be written as a sum of positive squares in 3 ways, for example, as 107889769 + 1123322256 = 10387^2 + 33516^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1231212025 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231211993 and 1231212011.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 24624216 + ... + 24624265.

Almost surely, 2^1231212025 is an apocalyptic number.

It is an amenable number.

1231212025 is a deficient number, since it is larger than the sum of its proper divisors (295490917).

1231212025 is an equidigital number, since it uses as much as digits as its factorization.

1231212025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49248491 (or 49248486 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1231212025 is about 35088.6309935284. The cubic root of 1231212025 is about 1071.7930819653.

Adding to 1231212025 its reverse (5202121321), we get a palindrome (6433333346).

The spelling of 1231212025 in words is "one billion, two hundred thirty-one million, two hundred twelve thousand, twenty-five".