131231232101 has 4 divisors (see below), whose sum is σ = 131235058752. Its totient is φ = 131227405452.

The previous prime is 131231232073. The next prime is 131231232113. The reversal of 131231232101 is 101232132131.

It is a happy number.

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-131231232101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131231232191) 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, 1861415 + ... + 1930628.

It is an arithmetic number, because the mean of its divisors is an integer number (32808764688).

Almost surely, 2^131231232101 is an apocalyptic number.

It is an amenable number.

131231232101 is a deficient number, since it is larger than the sum of its proper divisors (3826651).

131231232101 is an equidigital number, since it uses as much as digits as its factorization.

131231232101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3826650.

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

Adding to 131231232101 its reverse (101232132131), we get a palindrome (232463364232).

The spelling of 131231232101 in words is "one hundred thirty-one billion, two hundred thirty-one million, two hundred thirty-two thousand, one hundred one".