136523599081 has 3 divisors (see below), whose sum is σ = 136523968573. Its totient is φ = 136523229590.

The previous prime is 136523599061. The next prime is 136523599171. The reversal of 136523599081 is 180995325631.

The square root of 136523599081 is 369491.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 136523599081 - 2⁵ = 136523599049 is a prime.

It is a super-2 number, since 2×136523599081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136523599061) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 184746 + ... + 554236.

Almost surely, 2^136523599081 is an apocalyptic number.

136523599081 is the 369491-st square number.

136523599081 is the 184746-th centered octagonal number.

It is an amenable number.

136523599081 is a deficient number, since it is larger than the sum of its proper divisors (369492).

136523599081 is an frugal number, since it uses more digits than its factorization.

136523599081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738982 (or 369491 counting only the distinct ones).

The product of its (nonzero) digits is 1749600, while the sum is 52.

The spelling of 136523599081 in words is "one hundred thirty-six billion, five hundred twenty-three million, five hundred ninety-nine thousand, eighty-one".