136197661 has 2 divisors, whose sum is σ = 136197662. Its totient is φ = 136197660.

The previous prime is 136197619. The next prime is 136197671. The reversal of 136197661 is 166791631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118135161 + 18062500 = 10869^2 + 4250^2 .

It is an emirp because it is prime and its reverse (166791631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 136197661 - 2¹⁵ = 136164893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136197671) 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, 68098830 + 68098831.

It is an arithmetic number, because the mean of its divisors is an integer number (68098831).

Almost surely, 2^136197661 is an apocalyptic number.

It is an amenable number.

136197661 is a deficient number, since it is larger than the sum of its proper divisors (1).

136197661 is an equidigital number, since it uses as much as digits as its factorization.

136197661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 40.

The square root of 136197661 is about 11670.3753581451. The cubic root of 136197661 is about 514.5053358103.

The spelling of 136197661 in words is "one hundred thirty-six million, one hundred ninety-seven thousand, six hundred sixty-one".