136505649 has 16 divisors (see below), whose sum is σ = 208438272. Its totient is φ = 77842128.

The previous prime is 136505623. The next prime is 136505651. The reversal of 136505649 is 946505631.

It is not a de Polignac number, because 136505649 - 2⁹ = 136505137 is a prime.

It is a super-2 number, since 2×136505649² = 37267584417822402, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (136505609) 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 in 15 ways as a sum of consecutive naturals, for example, 4102 + ... + 17024.

It is an arithmetic number, because the mean of its divisors is an integer number (13027392).

Almost surely, 2^136505649 is an apocalyptic number.

It is an amenable number.

136505649 is a deficient number, since it is larger than the sum of its proper divisors (71932623).

136505649 is a wasteful number, since it uses less digits than its factorization.

136505649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13436.

The product of its (nonzero) digits is 97200, while the sum is 39.

The square root of 136505649 is about 11683.5631979290. The cubic root of 136505649 is about 514.8928661429.

The spelling of 136505649 in words is "one hundred thirty-six million, five hundred five thousand, six hundred forty-nine".