131945287 has 2 divisors, whose sum is σ = 131945288. Its totient is φ = 131945286.

The previous prime is 131945267. The next prime is 131945321. The reversal of 131945287 is 782549131.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131945287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131945267) 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, 65972643 + 65972644.

It is an arithmetic number, because the mean of its divisors is an integer number (65972644).

Almost surely, 2^131945287 is an apocalyptic number.

131945287 is a deficient number, since it is larger than the sum of its proper divisors (1).

131945287 is an equidigital number, since it uses as much as digits as its factorization.

131945287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 40.

The square root of 131945287 is about 11486.7439685927. The cubic root of 131945287 is about 509.0939789906.

It can be divided in two parts, 13194 and 5287, that added together give a palindrome (18481).

The spelling of 131945287 in words is "one hundred thirty-one million, nine hundred forty-five thousand, two hundred eighty-seven".