131261087 has 2 divisors, whose sum is σ = 131261088. Its totient is φ = 131261086.

The previous prime is 131261057. The next prime is 131261111. The reversal of 131261087 is 780162131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 131261087 - 2²⁴ = 114483871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131261057) 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, 65630543 + 65630544.

It is an arithmetic number, because the mean of its divisors is an integer number (65630544).

Almost surely, 2^131261087 is an apocalyptic number.

131261087 is a deficient number, since it is larger than the sum of its proper divisors (1).

131261087 is an equidigital number, since it uses as much as digits as its factorization.

131261087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 131261087 is about 11456.9231035213. The cubic root of 131261087 is about 508.2124875746.

The spelling of 131261087 in words is "one hundred thirty-one million, two hundred sixty-one thousand, eighty-seven".