231311101123 has 4 divisors (see below), whose sum is σ = 231312734208. Its totient is φ = 231309468040.

The previous prime is 231311101081. The next prime is 231311101127. The reversal of 231311101123 is 321101113132.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231311101123 is a prime.

It is a super-2 number, since 2×231311101123² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231311101123.

It is not an unprimeable number, because it can be changed into a prime (231311101127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 581536 + ... + 894877.

It is an arithmetic number, because the mean of its divisors is an integer number (57828183552).

Almost surely, 2^231311101123 is an apocalyptic number.

231311101123 is a deficient number, since it is larger than the sum of its proper divisors (1633085).

231311101123 is a wasteful number, since it uses less digits than its factorization.

231311101123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633084.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 231311101123 its reverse (321101113132), we get a palindrome (552412214255).

The spelling of 231311101123 in words is "two hundred thirty-one billion, three hundred eleven million, one hundred one thousand, one hundred twenty-three".