136521749 has 24 divisors (see below), whose sum is σ = 173571840. Its totient is φ = 105064128.

The previous prime is 136521743. The next prime is 136521757. The reversal of 136521749 is 947125631.

It is not a de Polignac number, because 136521749 - 2¹⁶ = 136456213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136521743) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42212 + ... + 45330.

It is an arithmetic number, because the mean of its divisors is an integer number (7232160).

Almost surely, 2^136521749 is an apocalyptic number.

It is an amenable number.

136521749 is a deficient number, since it is larger than the sum of its proper divisors (37050091).

136521749 is a wasteful number, since it uses less digits than its factorization.

136521749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3189 (or 3176 counting only the distinct ones).

The product of its digits is 45360, while the sum is 38.

The square root of 136521749 is about 11684.2521797503. The cubic root of 136521749 is about 514.9131081605.

The spelling of 136521749 in words is "one hundred thirty-six million, five hundred twenty-one thousand, seven hundred forty-nine".