131263981 has 2 divisors, whose sum is σ = 131263982. Its totient is φ = 131263980.

The previous prime is 131263969. The next prime is 131263991. The reversal of 131263981 is 189362131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122655625 + 8608356 = 11075^2 + 2934^2 .

It is a cyclic number.

It is not a de Polignac number, because 131263981 - 2¹⁵ = 131231213 is a prime.

It is a super-2 number, since 2×131263981² = 34460465415936722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131263991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65631990 + 65631991.

It is an arithmetic number, because the mean of its divisors is an integer number (65631991).

Almost surely, 2^131263981 is an apocalyptic number.

It is an amenable number.

131263981 is a deficient number, since it is larger than the sum of its proper divisors (1).

131263981 is an equidigital number, since it uses as much as digits as its factorization.

131263981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 34.

The square root of 131263981 is about 11457.0494020057. The cubic root of 131263981 is about 508.2162225127.

The spelling of 131263981 in words is "one hundred thirty-one million, two hundred sixty-three thousand, nine hundred eighty-one".