1231042525 has 12 divisors (see below), whose sum is σ = 1551519124. Its totient is φ = 968688000.

The previous prime is 1231042487. The next prime is 1231042529. The reversal of 1231042525 is 5252401321.

It can be written as a sum of positive squares in 6 ways, for example, as 94206436 + 1136836089 = 9706^2 + 33717^2 .

It is not a de Polignac number, because 1231042525 - 2¹⁵ = 1231009757 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1231042525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231042529) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 402096 + ... + 405145.

Almost surely, 2^1231042525 is an apocalyptic number.

It is an amenable number.

1231042525 is a deficient number, since it is larger than the sum of its proper divisors (320476599).

1231042525 is an equidigital number, since it uses as much as digits as its factorization.

1231042525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807312 (or 807307 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 1231042525 is about 35086.2155981519. The cubic root of 1231042525 is about 1071.7438954019.

Adding to 1231042525 its reverse (5252401321), we get a palindrome (6483443846).

The spelling of 1231042525 in words is "one billion, two hundred thirty-one million, forty-two thousand, five hundred twenty-five".