1231806906 has 64 divisors (see below), whose sum is σ = 3116067840. Its totient is φ = 357041520.

The previous prime is 1231806899. The next prime is 1231806913. The reversal of 1231806906 is 6096081321.

It is an interprime number because it is at equal distance from previous prime (1231806899) and next prime (1231806913).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31420 + ... + 58743.

It is an arithmetic number, because the mean of its divisors is an integer number (48688560).

Almost surely, 2^1231806906 is an apocalyptic number.

1231806906 is an abundant number, since it is smaller than the sum of its proper divisors (1884260934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231806906 is a wasteful number, since it uses less digits than its factorization.

1231806906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90208 (or 90202 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 1231806906 is about 35097.1068038378. The cubic root of 1231806906 is about 1071.9656725150.

The spelling of 1231806906 in words is "one billion, two hundred thirty-one million, eight hundred six thousand, nine hundred six".