131603609 has 2 divisors, whose sum is σ = 131603610. Its totient is φ = 131603608.

The previous prime is 131603599. The next prime is 131603627. The reversal of 131603609 is 906306131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84640000 + 46963609 = 9200^2 + 6853^2 .

It is a cyclic number.

It is not a de Polignac number, because 131603609 - 2¹² = 131599513 is a prime.

It is not a weakly prime, because it can be changed into another prime (131603629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65801804 + 65801805.

It is an arithmetic number, because the mean of its divisors is an integer number (65801805).

Almost surely, 2^131603609 is an apocalyptic number.

It is an amenable number.

131603609 is a deficient number, since it is larger than the sum of its proper divisors (1).

131603609 is an equidigital number, since it uses as much as digits as its factorization.

131603609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 131603609 is about 11471.8616187609. The cubic root of 131603609 is about 508.6541588704.

The spelling of 131603609 in words is "one hundred thirty-one million, six hundred three thousand, six hundred nine".