136368581 has 2 divisors, whose sum is σ = 136368582. Its totient is φ = 136368580.

The previous prime is 136368539. The next prime is 136368607. The reversal of 136368581 is 185863631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114597025 + 21771556 = 10705^2 + 4666^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136368581 is a prime.

It is a super-2 number, since 2×136368581² = 37192779767907122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136368521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68184290 + 68184291.

It is an arithmetic number, because the mean of its divisors is an integer number (68184291).

Almost surely, 2^136368581 is an apocalyptic number.

It is an amenable number.

136368581 is a deficient number, since it is larger than the sum of its proper divisors (1).

136368581 is an equidigital number, since it uses as much as digits as its factorization.

136368581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 41.

The square root of 136368581 is about 11677.6958771840. The cubic root of 136368581 is about 514.7204704188.

The spelling of 136368581 in words is "one hundred thirty-six million, three hundred sixty-eight thousand, five hundred eighty-one".