131334661 has 2 divisors, whose sum is σ = 131334662. Its totient is φ = 131334660.

The previous prime is 131334659. The next prime is 131334667. The reversal of 131334661 is 166433131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73102500 + 58232161 = 8550^2 + 7631^2 .

It is a cyclic number.

It is not a de Polignac number, because 131334661 - 2¹ = 131334659 is a prime.

Together with 131334659, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131334667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65667330 + 65667331.

It is an arithmetic number, because the mean of its divisors is an integer number (65667331).

Almost surely, 2^131334661 is an apocalyptic number.

It is an amenable number.

131334661 is a deficient number, since it is larger than the sum of its proper divisors (1).

131334661 is an equidigital number, since it uses as much as digits as its factorization.

131334661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 28.

The square root of 131334661 is about 11460.1335507052. The cubic root of 131334661 is about 508.3074236607.

Adding to 131334661 its reverse (166433131), we get a palindrome (297767792).

The spelling of 131334661 in words is "one hundred thirty-one million, three hundred thirty-four thousand, six hundred sixty-one".