136408523 has 4 divisors (see below), whose sum is σ = 139310880. Its totient is φ = 133506168.

The previous prime is 136408507. The next prime is 136408553. The reversal of 136408523 is 325804631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 325804631 = 83 ⋅3925357.

It is a cyclic number.

It is not a de Polignac number, because 136408523 - 2⁴ = 136408507 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 136408523.

It is not an unprimeable number, because it can be changed into a prime (136408553) 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, 1451108 + ... + 1451201.

It is an arithmetic number, because the mean of its divisors is an integer number (34827720).

Almost surely, 2^136408523 is an apocalyptic number.

136408523 is a deficient number, since it is larger than the sum of its proper divisors (2902357).

136408523 is an equidigital number, since it uses as much as digits as its factorization.

136408523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2902356.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 136408523 is about 11679.4059352349. The cubic root of 136408523 is about 514.7707189389.

The spelling of 136408523 in words is "one hundred thirty-six million, four hundred eight thousand, five hundred twenty-three".