1231210225 has 24 divisors (see below), whose sum is σ = 1804973760. Its totient is φ = 815142720.

The previous prime is 1231210163. The next prime is 1231210237. The reversal of 1231210225 is 5220121321.

It is a de Polignac number, because none of the positive numbers 2^k-1231210225 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 116227 + ... + 126376.

It is an arithmetic number, because the mean of its divisors is an integer number (75207240).

Almost surely, 2^1231210225 is an apocalyptic number.

It is an amenable number.

1231210225 is a deficient number, since it is larger than the sum of its proper divisors (573763535).

1231210225 is a wasteful number, since it uses less digits than its factorization.

1231210225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242649 (or 242644 counting only the distinct ones).

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

The square root of 1231210225 is about 35088.6053441855. The cubic root of 1231210225 is about 1071.7925596538.

Adding to 1231210225 its reverse (5220121321), we get a palindrome (6451331546).

The spelling of 1231210225 in words is "one billion, two hundred thirty-one million, two hundred ten thousand, two hundred twenty-five".