131021287 has 2 divisors, whose sum is σ = 131021288. Its totient is φ = 131021286.

The previous prime is 131021279. The next prime is 131021291. The reversal of 131021287 is 782120131.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 131021287 - 2³ = 131021279 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131021257) 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, 65510643 + 65510644.

It is an arithmetic number, because the mean of its divisors is an integer number (65510644).

Almost surely, 2^131021287 is an apocalyptic number.

131021287 is a deficient number, since it is larger than the sum of its proper divisors (1).

131021287 is an equidigital number, since it uses as much as digits as its factorization.

131021287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 131021287 is about 11446.4530313980. The cubic root of 131021287 is about 507.9028155897.

The spelling of 131021287 in words is "one hundred thirty-one million, twenty-one thousand, two hundred eighty-seven".