231311133011 has 16 divisors (see below), whose sum is σ = 265898999808. Its totient is φ = 197112458400.

The previous prime is 231311132999. The next prime is 231311133019. The reversal of 231311133011 is 110331113132.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231311133011 is a prime.

It is a super-2 number, since 2×231311133011² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231311133019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 695081 + ... + 972501.

It is an arithmetic number, because the mean of its divisors is an integer number (16618687488).

Almost surely, 2^231311133011 is an apocalyptic number.

231311133011 is a deficient number, since it is larger than the sum of its proper divisors (34587866797).

231311133011 is a wasteful number, since it uses less digits than its factorization.

231311133011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278122.

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

Adding to 231311133011 its reverse (110331113132), we get a palindrome (341642246143).

The spelling of 231311133011 in words is "two hundred thirty-one billion, three hundred eleven million, one hundred thirty-three thousand, eleven".