231201320331 has 4 divisors (see below), whose sum is σ = 308268427112. Its totient is φ = 154134213552.

The previous prime is 231201320293. The next prime is 231201320381. The reversal of 231201320331 is 133023102132.

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

It is not a de Polignac number, because 231201320331 - 2²¹ = 231199223179 is a prime.

It is a super-2 number, since 2×231201320331² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231201320298 and 231201320307.

It is not an unprimeable number, because it can be changed into a prime (231201320381) 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, 38533553386 + ... + 38533553391.

It is an arithmetic number, because the mean of its divisors is an integer number (77067106778).

Almost surely, 2^231201320331 is an apocalyptic number.

231201320331 is a deficient number, since it is larger than the sum of its proper divisors (77067106781).

231201320331 is an equidigital number, since it uses as much as digits as its factorization.

231201320331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77067106780.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 231201320331 its reverse (133023102132), we get a palindrome (364224422463).

The spelling of 231201320331 in words is "two hundred thirty-one billion, two hundred one million, three hundred twenty thousand, three hundred thirty-one".