131161549 has 2 divisors, whose sum is σ = 131161550. Its totient is φ = 131161548.

The previous prime is 131161531. The next prime is 131161573. The reversal of 131161549 is 945161131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131102500 + 59049 = 11450^2 + 243^2 .

It is a cyclic number.

It is not a de Polignac number, because 131161549 - 2⁷ = 131161421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131161549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131161649) 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, 65580774 + 65580775.

It is an arithmetic number, because the mean of its divisors is an integer number (65580775).

Almost surely, 2^131161549 is an apocalyptic number.

It is an amenable number.

131161549 is a deficient number, since it is larger than the sum of its proper divisors (1).

131161549 is an equidigital number, since it uses as much as digits as its factorization.

131161549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 31.

The square root of 131161549 is about 11452.5782686695. The cubic root of 131161549 is about 508.0839924050.

The spelling of 131161549 in words is "one hundred thirty-one million, one hundred sixty-one thousand, five hundred forty-nine".