135091661 has 2 divisors, whose sum is σ = 135091662. Its totient is φ = 135091660.

The previous prime is 135091633. The next prime is 135091667. The reversal of 135091661 is 166190531.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125574436 + 9517225 = 11206^2 + 3085^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135091661 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135091667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67545830 + 67545831.

It is an arithmetic number, because the mean of its divisors is an integer number (67545831).

Almost surely, 2^135091661 is an apocalyptic number.

It is an amenable number.

135091661 is a deficient number, since it is larger than the sum of its proper divisors (1).

135091661 is an equidigital number, since it uses as much as digits as its factorization.

135091661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 135091661 is about 11622.8938307119. The cubic root of 135091661 is about 513.1088600364.

The spelling of 135091661 in words is "one hundred thirty-five million, ninety-one thousand, six hundred sixty-one".