231056005511 has 4 divisors (see below), whose sum is σ = 236429401032. Its totient is φ = 225682609992.

The previous prime is 231056005507. The next prime is 231056005517. The reversal of 231056005511 is 115500650132.

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 231056005511 - 2² = 231056005507 is a prime.

It is a super-2 number, since 2×231056005511² (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 (231056005517) 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, 2686697696 + ... + 2686697781.

It is an arithmetic number, because the mean of its divisors is an integer number (59107350258).

Almost surely, 2^231056005511 is an apocalyptic number.

231056005511 is a deficient number, since it is larger than the sum of its proper divisors (5373395521).

231056005511 is an equidigital number, since it uses as much as digits as its factorization.

231056005511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5373395520.

The product of its (nonzero) digits is 4500, while the sum is 29.

Adding to 231056005511 its reverse (115500650132), we get a palindrome (346556655643).

The spelling of 231056005511 in words is "two hundred thirty-one billion, fifty-six million, five thousand, five hundred eleven".