131564647 has 2 divisors, whose sum is σ = 131564648. Its totient is φ = 131564646.

The previous prime is 131564627. The next prime is 131564659. The reversal of 131564647 is 746465131.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131564647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131564627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65782323 + 65782324.

It is an arithmetic number, because the mean of its divisors is an integer number (65782324).

Almost surely, 2^131564647 is an apocalyptic number.

131564647 is a deficient number, since it is larger than the sum of its proper divisors (1).

131564647 is an equidigital number, since it uses as much as digits as its factorization.

131564647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 37.

The square root of 131564647 is about 11470.1633379826. The cubic root of 131564647 is about 508.6039572597.

The spelling of 131564647 in words is "one hundred thirty-one million, five hundred sixty-four thousand, six hundred forty-seven".