1231355425 has 6 divisors (see below), whose sum is σ = 1526880758. Its totient is φ = 985084320.

The previous prime is 1231355387. The next prime is 1231355431. The reversal of 1231355425 is 5245531321.

It can be written as a sum of positive squares in 3 ways, for example, as 22819729 + 1208535696 = 4777^2 + 34764^2 .

It is not a de Polignac number, because 1231355425 - 2⁹ = 1231354913 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24627084 + ... + 24627133.

Almost surely, 2^1231355425 is an apocalyptic number.

It is an amenable number.

1231355425 is a deficient number, since it is larger than the sum of its proper divisors (295525333).

1231355425 is an equidigital number, since it uses as much as digits as its factorization.

1231355425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49254227 (or 49254222 counting only the distinct ones).

The product of its digits is 18000, while the sum is 31.

The square root of 1231355425 is about 35090.6743309387. The cubic root of 1231355425 is about 1071.8346911434.

Adding to 1231355425 its reverse (5245531321), we get a palindrome (6476886746).

The spelling of 1231355425 in words is "one billion, two hundred thirty-one million, three hundred fifty-five thousand, four hundred twenty-five".