131321320231 has 4 divisors (see below), whose sum is σ = 139046103792. Its totient is φ = 123596536672.

The previous prime is 131321320219. The next prime is 131321320241. The reversal of 131321320231 is 132023123131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132023123131 = 5857 ⋅22541083.

It is a cyclic number.

It is not a de Polignac number, because 131321320231 - 2¹³ = 131321312039 is a prime.

It is a super-2 number, since 2×131321320231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131321320241) 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, 3862391755 + ... + 3862391788.

It is an arithmetic number, because the mean of its divisors is an integer number (34761525948).

Almost surely, 2^131321320231 is an apocalyptic number.

131321320231 is a deficient number, since it is larger than the sum of its proper divisors (7724783561).

131321320231 is an equidigital number, since it uses as much as digits as its factorization.

131321320231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7724783560.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 131321320231 its reverse (132023123131), we get a palindrome (263344443362).

The spelling of 131321320231 in words is "one hundred thirty-one billion, three hundred twenty-one million, three hundred twenty thousand, two hundred thirty-one".