231311232001 has 4 divisors (see below), whose sum is σ = 241368242112. Its totient is φ = 221254221892.

The previous prime is 231311231971. The next prime is 231311232043. The reversal of 231311232001 is 100232113132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231311232001 is a prime.

It is a super-3 number, since 3×231311232001³ (a number of 35 digits) contains 333 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 231311232001.

It is not an unprimeable number, because it can be changed into a prime (231311238001) 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, 5028505021 + ... + 5028505066.

It is an arithmetic number, because the mean of its divisors is an integer number (60342060528).

Almost surely, 2^231311232001 is an apocalyptic number.

It is an amenable number.

231311232001 is a deficient number, since it is larger than the sum of its proper divisors (10057010111).

231311232001 is a wasteful number, since it uses less digits than its factorization.

231311232001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10057010110.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 231311232001 its reverse (100232113132), we get a palindrome (331543345133).

The spelling of 231311232001 in words is "two hundred thirty-one billion, three hundred eleven million, two hundred thirty-two thousand, one".