231111203431 has 8 divisors (see below), whose sum is σ = 244221551280. Its totient is φ = 218095515648.

The previous prime is 231111203429. The next prime is 231111203443. The reversal of 231111203431 is 134302111132.

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

It is a cyclic number.

It is not a de Polignac number, because 231111203431 - 2¹ = 231111203429 is a prime.

It is a super-2 number, since 2×231111203431² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231111203831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23659996 + ... + 23669761.

It is an arithmetic number, because the mean of its divisors is an integer number (30527693910).

Almost surely, 2^231111203431 is an apocalyptic number.

231111203431 is a deficient number, since it is larger than the sum of its proper divisors (13110347849).

231111203431 is a wasteful number, since it uses less digits than its factorization.

231111203431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47330033.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 231111203431 its reverse (134302111132), we get a palindrome (365413314563).

The spelling of 231111203431 in words is "two hundred thirty-one billion, one hundred eleven million, two hundred three thousand, four hundred thirty-one".