136605381 has 8 divisors (see below), whose sum is σ = 198698784. Its totient is φ = 82791120.

The previous prime is 136605331. The next prime is 136605389. The reversal of 136605381 is 183506631.

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

It is not a de Polignac number, because 136605381 - 2¹³ = 136597189 is a prime.

It is a super-2 number, since 2×136605381² = 37322060236310322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 4139557 = 136605381 / (1 + 3 + 6 + 6 + 0 + 5 + 3 + 8 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136605389) 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, 2069746 + ... + 2069811.

It is an arithmetic number, because the mean of its divisors is an integer number (24837348).

Almost surely, 2^136605381 is an apocalyptic number.

136605381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

136605381 is a deficient number, since it is larger than the sum of its proper divisors (62093403).

136605381 is a wasteful number, since it uses less digits than its factorization.

136605381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4139571.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 136605381 is about 11687.8304659162. The cubic root of 136605381 is about 515.0182304163.

The spelling of 136605381 in words is "one hundred thirty-six million, six hundred five thousand, three hundred eighty-one".