136371661 has 8 divisors (see below), whose sum is σ = 138886200. Its totient is φ = 133866240.

The previous prime is 136371647. The next prime is 136371667. The reversal of 136371661 is 166173631.

It can be written as a sum of positive squares in 4 ways, for example, as 11356900 + 125014761 = 3370^2 + 11181^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 136371661 - 2⁵ = 136371629 is a prime.

It is a super-3 number, since 3×136371661³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136371667) 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 7 ways as a sum of consecutive naturals, for example, 32745 + ... + 36673.

It is an arithmetic number, because the mean of its divisors is an integer number (17360775).

Almost surely, 2^136371661 is an apocalyptic number.

It is an amenable number.

136371661 is a deficient number, since it is larger than the sum of its proper divisors (2514539).

136371661 is an equidigital number, since it uses as much as digits as its factorization.

136371661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4559.

The product of its digits is 13608, while the sum is 34.

The square root of 136371661 is about 11677.8277517696. The cubic root of 136371661 is about 514.7243455224.

The spelling of 136371661 in words is "one hundred thirty-six million, three hundred seventy-one thousand, six hundred sixty-one".