136661293 has 2 divisors, whose sum is σ = 136661294. Its totient is φ = 136661292.

The previous prime is 136661233. The next prime is 136661303. The reversal of 136661293 is 392166631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134142724 + 2518569 = 11582^2 + 1587^2 .

It is a cyclic number.

It is not a de Polignac number, because 136661293 - 2²¹ = 134564141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136661233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68330646 + 68330647.

It is an arithmetic number, because the mean of its divisors is an integer number (68330647).

Almost surely, 2^136661293 is an apocalyptic number.

It is an amenable number.

136661293 is a deficient number, since it is larger than the sum of its proper divisors (1).

136661293 is an equidigital number, since it uses as much as digits as its factorization.

136661293 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 37.

The square root of 136661293 is about 11690.2221108070. Note that the first 3 decimals coincide. The cubic root of 136661293 is about 515.0884857541.

The spelling of 136661293 in words is "one hundred thirty-six million, six hundred sixty-one thousand, two hundred ninety-three".