1531231325 has 48 divisors (see below), whose sum is σ = 2161528320. Its totient is φ = 1067489280.

The previous prime is 1531231301. The next prime is 1531231343. The reversal of 1531231325 is 5231321351.

It is not a de Polignac number, because 1531231325 - 2⁸ = 1531231069 is a prime.

It is a super-2 number, since 2×1531231325² = 4689338741322511250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1531231294 and 1531231303.

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 589229 + ... + 591821.

It is an arithmetic number, because the mean of its divisors is an integer number (45031840).

Almost surely, 2^1531231325 is an apocalyptic number.

It is an amenable number.

1531231325 is a deficient number, since it is larger than the sum of its proper divisors (630296995).

1531231325 is a wasteful number, since it uses less digits than its factorization.

1531231325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2718 (or 2713 counting only the distinct ones).

The product of its digits is 2700, while the sum is 26.

The square root of 1531231325 is about 39130.9509851217. The cubic root of 1531231325 is about 1152.6043872868.

Adding to 1531231325 its reverse (5231321351), we get a palindrome (6762552676).

The spelling of 1531231325 in words is "one billion, five hundred thirty-one million, two hundred thirty-one thousand, three hundred twenty-five".