1811310431906 has 8 divisors (see below), whose sum is σ = 2719060459500. Its totient is φ = 904956945408.

The previous prime is 1811310431893. The next prime is 1811310431911. The reversal of 1811310431906 is 6091340131181.

It can be written as a sum of positive squares in 2 ways, for example, as 1810932712681 + 377719225 = 1345709^2 + 19435^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1811310431906.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 349132031 + ... + 349137218.

Almost surely, 2^{1811310431906} is an apocalyptic number.

1811310431906 is a deficient number, since it is larger than the sum of its proper divisors (907750027594).

1811310431906 is a wasteful number, since it uses less digits than its factorization.

1811310431906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698270548.

The product of its (nonzero) digits is 15552, while the sum is 38.

The spelling of 1811310431906 in words is "one trillion, eight hundred eleven billion, three hundred ten million, four hundred thirty-one thousand, nine hundred six".