136617521 has 4 divisors (see below), whose sum is σ = 141328500. Its totient is φ = 131906544.

The previous prime is 136617499. The next prime is 136617553. The reversal of 136617521 is 125716631.

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 58736896 + 77880625 = 7664^2 + 8825^2 .

It is a cyclic number.

It is not a de Polignac number, because 136617521 - 2¹⁸ = 136355377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136617571) 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 3 ways as a sum of consecutive naturals, for example, 2355446 + ... + 2355503.

It is an arithmetic number, because the mean of its divisors is an integer number (35332125).

Almost surely, 2^136617521 is an apocalyptic number.

It is an amenable number.

136617521 is a deficient number, since it is larger than the sum of its proper divisors (4710979).

136617521 is an equidigital number, since it uses as much as digits as its factorization.

136617521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4710978.

The product of its digits is 7560, while the sum is 32.

The square root of 136617521 is about 11688.3497979826. The cubic root of 136617521 is about 515.0334863701.

The spelling of 136617521 in words is "one hundred thirty-six million, six hundred seventeen thousand, five hundred twenty-one".