1231231625 has 32 divisors (see below), whose sum is σ = 1682038176. Its totient is φ = 894240000.

The previous prime is 1231231621. The next prime is 1231231637. The reversal of 1231231625 is 5261321321.

It is a happy number.

It can be written as a sum of positive squares in 16 ways, for example, as 1063477321 + 167754304 = 32611^2 + 12952^2 .

It is not a de Polignac number, because 1231231625 - 2² = 1231231621 is a prime.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1231231594 and 1231231603.

It is not an unprimeable number, because it can be changed into a prime (1231231621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 92915 + ... + 105335.

It is an arithmetic number, because the mean of its divisors is an integer number (52563693).

Almost surely, 2^1231231625 is an apocalyptic number.

It is an amenable number.

1231231625 is a deficient number, since it is larger than the sum of its proper divisors (450806551).

1231231625 is a wasteful number, since it uses less digits than its factorization.

1231231625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12510 (or 12500 counting only the distinct ones).

The product of its digits is 2160, while the sum is 26.

The square root of 1231231625 is about 35088.9102851599. The cubic root of 1231231625 is about 1071.7987693239.

Adding to 1231231625 its reverse (5261321321), we get a palindrome (6492552946).

The spelling of 1231231625 in words is "one billion, two hundred thirty-one million, two hundred thirty-one thousand, six hundred twenty-five".