131278663 has 2 divisors, whose sum is σ = 131278664. Its totient is φ = 131278662.

The previous prime is 131278579. The next prime is 131278669. The reversal of 131278663 is 366872131.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131278663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131278669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65639331 + 65639332.

It is an arithmetic number, because the mean of its divisors is an integer number (65639332).

Almost surely, 2^131278663 is an apocalyptic number.

131278663 is a deficient number, since it is larger than the sum of its proper divisors (1).

131278663 is an equidigital number, since it uses as much as digits as its factorization.

131278663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 37.

The square root of 131278663 is about 11457.6901249772. The cubic root of 131278663 is about 508.2351699608.

The spelling of 131278663 in words is "one hundred thirty-one million, two hundred seventy-eight thousand, six hundred sixty-three".