231133311011 has 4 divisors (see below), whose sum is σ = 231134815272. Its totient is φ = 231131806752.

The previous prime is 231133311007. The next prime is 231133311043. The reversal of 231133311011 is 110113331132.

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

It is a cyclic number.

It is not a de Polignac number, because 231133311011 - 2² = 231133311007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231133313011) 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, 491561 + ... + 838986.

It is an arithmetic number, because the mean of its divisors is an integer number (57783703818).

Almost surely, 2^231133311011 is an apocalyptic number.

231133311011 is a deficient number, since it is larger than the sum of its proper divisors (1504261).

231133311011 is a wasteful number, since it uses less digits than its factorization.

231133311011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1504260.

The product of its (nonzero) digits is 162, while the sum is 20.

Adding to 231133311011 its reverse (110113331132), we get a palindrome (341246642143).

The spelling of 231133311011 in words is "two hundred thirty-one billion, one hundred thirty-three million, three hundred eleven thousand, eleven".