1231545425 has 24 divisors (see below), whose sum is σ = 1690835232. Its totient is φ = 882288000.

The previous prime is 1231545391. The next prime is 1231545431. The reversal of 1231545425 is 5245451321.

It is not a de Polignac number, because 1231545425 - 2⁶ = 1231545361 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231545391 and 1231545400.

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, 14996 + ... + 51845.

It is an arithmetic number, because the mean of its divisors is an integer number (70451468).

Almost surely, 2^1231545425 is an apocalyptic number.

It is an amenable number.

1231545425 is a deficient number, since it is larger than the sum of its proper divisors (459289807).

1231545425 is a wasteful number, since it uses less digits than its factorization.

1231545425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66929 (or 66924 counting only the distinct ones).

The product of its digits is 24000, while the sum is 32.

The square root of 1231545425 is about 35093.3814985105. The cubic root of 1231545425 is about 1071.8898168782.

Adding to 1231545425 its reverse (5245451321), we get a palindrome (6476996746).

The spelling of 1231545425 in words is "one billion, two hundred thirty-one million, five hundred forty-five thousand, four hundred twenty-five".