131201109 has 12 divisors (see below), whose sum is σ = 204090796. Its totient is φ = 80739072.

The previous prime is 131201101. The next prime is 131201143. The reversal of 131201109 is 901102131.

It can be written as a sum of positive squares in 2 ways, for example, as 81540900 + 49660209 = 9030^2 + 7047^2 .

It is not a de Polignac number, because 131201109 - 2³ = 131201101 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131201091 and 131201100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131201101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 560572 + ... + 560805.

Almost surely, 2^131201109 is an apocalyptic number.

It is an amenable number.

131201109 is a deficient number, since it is larger than the sum of its proper divisors (72889687).

131201109 is a wasteful number, since it uses less digits than its factorization.

131201109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121396 (or 1121393 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 18.

The square root of 131201109 is about 11454.3052604687. The cubic root of 131201109 is about 508.1350688128.

The spelling of 131201109 in words is "one hundred thirty-one million, two hundred one thousand, one hundred nine".