136140581 has 4 divisors (see below), whose sum is σ = 136178700. Its totient is φ = 136102464.

The previous prime is 136140577. The next prime is 136140601. The reversal of 136140581 is 185041631.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38328481 + 97812100 = 6191^2 + 9890^2 .

It is a cyclic number.

It is not a de Polignac number, because 136140581 - 2² = 136140577 is a prime.

It is a super-2 number, since 2×136140581² = 37068515590035122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136140551) 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 in 3 ways as a sum of consecutive naturals, for example, 13076 + ... + 21053.

It is an arithmetic number, because the mean of its divisors is an integer number (34044675).

Almost surely, 2^136140581 is an apocalyptic number.

It is an amenable number.

136140581 is a deficient number, since it is larger than the sum of its proper divisors (38119).

136140581 is an equidigital number, since it uses as much as digits as its factorization.

136140581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38118.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 136140581 is about 11667.9295935483. The cubic root of 136140581 is about 514.4334499253.

The spelling of 136140581 in words is "one hundred thirty-six million, one hundred forty thousand, five hundred eighty-one".