131201312231 has 4 divisors (see below), whose sum is σ = 143128704264. Its totient is φ = 119273920200.

The previous prime is 131201312219. The next prime is 131201312239. The reversal of 131201312231 is 132213102131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132213102131 = 11 ⋅12019372921.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131201312231 is a prime.

It is a super-2 number, since 2×131201312231² (a number of 23 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 (131201312239) 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, 5963696000 + ... + 5963696021.

It is an arithmetic number, because the mean of its divisors is an integer number (35782176066).

Almost surely, 2^131201312231 is an apocalyptic number.

131201312231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

131201312231 is a deficient number, since it is larger than the sum of its proper divisors (11927392033).

131201312231 is a wasteful number, since it uses less digits than its factorization.

131201312231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11927392032.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 131201312231 its reverse (132213102131), we get a palindrome (263414414362).

The spelling of 131201312231 in words is "one hundred thirty-one billion, two hundred one million, three hundred twelve thousand, two hundred thirty-one".