1231086825 has 36 divisors (see below), whose sum is σ = 2214734860. Its totient is φ = 653685120.

The previous prime is 1231086803. The next prime is 1231086827. The reversal of 1231086825 is 5286801321.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 159441129 + 1071645696 = 12627^2 + 32736^2 .

It is not a de Polignac number, because 1231086825 - 2⁷ = 1231086697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1231086825.

It is not an unprimeable number, because it can be changed into a prime (1231086827) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 39579 + ... + 63471.

Almost surely, 2^1231086825 is an apocalyptic number.

1231086825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1231086825 is a deficient number, since it is larger than the sum of its proper divisors (983648035).

1231086825 is a wasteful number, since it uses less digits than its factorization.

1231086825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24138 (or 24130 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 1231086825 is about 35086.8468945273. The cubic root of 1231086825 is about 1071.7567510870.

The spelling of 1231086825 in words is "one billion, two hundred thirty-one million, eighty-six thousand, eight hundred twenty-five".