131181869 has 12 divisors (see below), whose sum is σ = 164338524. Its totient is φ = 103791744.

The previous prime is 131181859. The next prime is 131181881. The reversal of 131181869 is 968181131.

It can be written as a sum of positive squares in 2 ways, for example, as 14822500 + 116359369 = 3850^2 + 10787^2 .

It is not a de Polignac number, because 131181869 - 2¹² = 131177773 is a prime.

It is a super-2 number, since 2×131181869² = 34417365508666322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131181829) 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, 102332 + ... + 103605.

It is an arithmetic number, because the mean of its divisors is an integer number (13694877).

Almost surely, 2^131181869 is an apocalyptic number.

It is an amenable number.

131181869 is a deficient number, since it is larger than the sum of its proper divisors (33156655).

131181869 is a wasteful number, since it uses less digits than its factorization.

131181869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205964 (or 205957 counting only the distinct ones).

The product of its digits is 10368, while the sum is 38.

The square root of 131181869 is about 11453.4653707950. The cubic root of 131181869 is about 508.1102290922.

The spelling of 131181869 in words is "one hundred thirty-one million, one hundred eighty-one thousand, eight hundred sixty-nine".