131231101 has 4 divisors (see below), whose sum is σ = 131255100. Its totient is φ = 131207104.

The previous prime is 131231071. The next prime is 131231131. The reversal of 131231101 is 101132131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 101132131 = 131 ⋅772001.

It is an interprime number because it is at equal distance from previous prime (131231071) and next prime (131231131).

It can be written as a sum of positive squares in 2 ways, for example, as 34503876 + 96727225 = 5874^2 + 9835^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131231101 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 (131231131) 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, 645 + ... + 16213.

It is an arithmetic number, because the mean of its divisors is an integer number (32813775).

Almost surely, 2^131231101 is an apocalyptic number.

It is an amenable number.

131231101 is a deficient number, since it is larger than the sum of its proper divisors (23999).

131231101 is an equidigital number, since it uses as much as digits as its factorization.

131231101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23998.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 131231101 is about 11455.6143877140. The cubic root of 131231101 is about 508.1737850147.

Adding to 131231101 its reverse (101132131), we get a palindrome (232363232).

The spelling of 131231101 in words is "one hundred thirty-one million, two hundred thirty-one thousand, one hundred one".