1231806532 has 12 divisors (see below), whose sum is σ = 2351630736. Its totient is φ = 559912040.

The previous prime is 1231806497. The next prime is 1231806533. The reversal of 1231806532 is 2356081321.

It is a junction number, because it is equal to n+sod(n) for n = 1231806494 and 1231806503.

It is not an unprimeable number, because it can be changed into a prime (1231806533) 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 3 ways as a sum of consecutive naturals, for example, 13997758 + ... + 13997845.

It is an arithmetic number, because the mean of its divisors is an integer number (195969228).

Almost surely, 2^1231806532 is an apocalyptic number.

It is an amenable number.

1231806532 is a deficient number, since it is larger than the sum of its proper divisors (1119824204).

1231806532 is a wasteful number, since it uses less digits than its factorization.

1231806532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27995618 (or 27995616 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 1231806532 is about 35097.1014757629. The cubic root of 1231806532 is about 1071.9655640253.

Adding to 1231806532 its reverse (2356081321), we get a palindrome (3587887853).

The spelling of 1231806532 in words is "one billion, two hundred thirty-one million, eight hundred six thousand, five hundred thirty-two".