136641385 has 8 divisors (see below), whose sum is σ = 165593736. Its totient is φ = 108230400.

The previous prime is 136641383. The next prime is 136641409. The reversal of 136641385 is 583146631.

136641385 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 26873856 + 109767529 = 5184^2 + 10477^2 .

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

It is not a de Polignac number, because 136641385 - 2¹ = 136641383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136641383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134784 + ... + 135793.

It is an arithmetic number, because the mean of its divisors is an integer number (20699217).

Almost surely, 2^136641385 is an apocalyptic number.

It is an amenable number.

136641385 is a deficient number, since it is larger than the sum of its proper divisors (28952351).

136641385 is a wasteful number, since it uses less digits than its factorization.

136641385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270683.

The product of its digits is 51840, while the sum is 37.

The square root of 136641385 is about 11689.3705989673. The cubic root of 136641385 is about 515.0634728692.

It can be divided in two parts, 136641 and 385, that added together give a triangular number (137026 = T₅₂₃).

The spelling of 136641385 in words is "one hundred thirty-six million, six hundred forty-one thousand, three hundred eighty-five".