131601611 has 2 divisors, whose sum is σ = 131601612. Its totient is φ = 131601610.

The previous prime is 131601593. The next prime is 131601643. The reversal of 131601611 is 116106131.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131601611 is a prime.

It is not a weakly prime, because it can be changed into another prime (131601671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65800805 + 65800806.

It is an arithmetic number, because the mean of its divisors is an integer number (65800806).

Almost surely, 2^131601611 is an apocalyptic number.

131601611 is a deficient number, since it is larger than the sum of its proper divisors (1).

131601611 is an equidigital number, since it uses as much as digits as its factorization.

131601611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 131601611 is about 11471.7745357900. The cubic root of 131601611 is about 508.6515847359.

Adding to 131601611 its reverse (116106131), we get a palindrome (247707742).

The spelling of 131601611 in words is "one hundred thirty-one million, six hundred one thousand, six hundred eleven".