231111203406 has 16 divisors (see below), whose sum is σ = 462227250000. Its totient is φ = 77036260608.

The previous prime is 231111203399. The next prime is 231111203413. The reversal of 231111203406 is 604302111132.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (231111203399) and next prime (231111203413).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 804720 + ... + 1053468.

It is an arithmetic number, because the mean of its divisors is an integer number (28889203125).

Almost surely, 2^231111203406 is an apocalyptic number.

231111203406 is an abundant number, since it is smaller than the sum of its proper divisors (231116046594).

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

231111203406 is a wasteful number, since it uses less digits than its factorization.

231111203406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403603.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 231111203406 its reverse (604302111132), we get a palindrome (835413314538).

The spelling of 231111203406 in words is "two hundred thirty-one billion, one hundred eleven million, two hundred three thousand, four hundred six".