131269781 has 2 divisors, whose sum is σ = 131269782. Its totient is φ = 131269780.

The previous prime is 131269771. The next prime is 131269807. The reversal of 131269781 is 187962131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131102500 + 167281 = 11450^2 + 409^2 .

It is a cyclic number.

It is not a de Polignac number, because 131269781 - 2¹⁸ = 131007637 is a prime.

It is a super-2 number, since 2×131269781² = 34463510807575922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131269751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65634890 + 65634891.

It is an arithmetic number, because the mean of its divisors is an integer number (65634891).

Almost surely, 2^131269781 is an apocalyptic number.

It is an amenable number.

131269781 is a deficient number, since it is larger than the sum of its proper divisors (1).

131269781 is an equidigital number, since it uses as much as digits as its factorization.

131269781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 38.

The square root of 131269781 is about 11457.3025184814. The cubic root of 131269781 is about 508.2237077108.

The spelling of 131269781 in words is "one hundred thirty-one million, two hundred sixty-nine thousand, seven hundred eighty-one".