1231166012 has 6 divisors (see below), whose sum is σ = 2154540528. Its totient is φ = 615583004.

The previous prime is 1231166003. The next prime is 1231166021. The reversal of 1231166012 is 2106611321.

It is an interprime number because it is at equal distance from previous prime (1231166003) and next prime (1231166021).

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 153895748 + ... + 153895755.

It is an arithmetic number, because the mean of its divisors is an integer number (359090088).

Almost surely, 2^1231166012 is an apocalyptic number.

It is an amenable number.

1231166012 is a deficient number, since it is larger than the sum of its proper divisors (923374516).

1231166012 is a wasteful number, since it uses less digits than its factorization.

1231166012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307791507 (or 307791505 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1231166012 is about 35087.9753191888. The cubic root of 1231166012 is about 1071.7797300734.

Adding to 1231166012 its reverse (2106611321), we get a palindrome (3337777333).

The spelling of 1231166012 in words is "one billion, two hundred thirty-one million, one hundred sixty-six thousand, twelve".