136437649 has 4 divisors (see below), whose sum is σ = 136603060. Its totient is φ = 136272240.

The previous prime is 136437643. The next prime is 136437659. The reversal of 136437649 is 946734631.

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 66129424 + 70308225 = 8132^2 + 8385^2 .

It is a cyclic number.

It is not a de Polignac number, because 136437649 - 2⁵ = 136437617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136437643) 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, 81462 + ... + 83119.

It is an arithmetic number, because the mean of its divisors is an integer number (34150765).

Almost surely, 2^136437649 is an apocalyptic number.

It is an amenable number.

136437649 is a deficient number, since it is larger than the sum of its proper divisors (165411).

136437649 is an equidigital number, since it uses as much as digits as its factorization.

136437649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165410.

The product of its digits is 326592, while the sum is 43.

The square root of 136437649 is about 11680.6527642936. The cubic root of 136437649 is about 514.8073543451.

The spelling of 136437649 in words is "one hundred thirty-six million, four hundred thirty-seven thousand, six hundred forty-nine".