136265681 has 2 divisors, whose sum is σ = 136265682. Its totient is φ = 136265680.

The previous prime is 136265671. The next prime is 136265687. The reversal of 136265681 is 186562631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133171600 + 3094081 = 11540^2 + 1759^2 .

It is an emirp because it is prime and its reverse (186562631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 136265681 - 2¹⁰ = 136264657 is a prime.

It is a super-2 number, since 2×136265681² = 37136671636787522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (136265687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68132840 + 68132841.

It is an arithmetic number, because the mean of its divisors is an integer number (68132841).

Almost surely, 2^136265681 is an apocalyptic number.

It is an amenable number.

136265681 is a deficient number, since it is larger than the sum of its proper divisors (1).

136265681 is an equidigital number, since it uses as much as digits as its factorization.

136265681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 38.

The square root of 136265681 is about 11673.2892108437. The cubic root of 136265681 is about 514.5909731805.

The spelling of 136265681 in words is "one hundred thirty-six million, two hundred sixty-five thousand, six hundred eighty-one".