131409869 has 2 divisors, whose sum is σ = 131409870. Its totient is φ = 131409868.

The previous prime is 131409823. The next prime is 131409911. The reversal of 131409869 is 968904131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120187369 + 11222500 = 10963^2 + 3350^2 .

It is a cyclic number.

It is not a de Polignac number, because 131409869 - 2¹⁶ = 131344333 is a prime.

It is a super-2 number, since 2×131409869² = 34537107341194322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131408869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65704934 + 65704935.

It is an arithmetic number, because the mean of its divisors is an integer number (65704935).

Almost surely, 2^131409869 is an apocalyptic number.

It is an amenable number.

131409869 is a deficient number, since it is larger than the sum of its proper divisors (1).

131409869 is an equidigital number, since it uses as much as digits as its factorization.

131409869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 131409869 is about 11463.4143692008. The cubic root of 131409869 is about 508.4044315376.

The spelling of 131409869 in words is "one hundred thirty-one million, four hundred nine thousand, eight hundred sixty-nine".