136605442 has 4 divisors (see below), whose sum is σ = 204908166. Its totient is φ = 68302720.

The previous prime is 136605401. The next prime is 136605451. The reversal of 136605442 is 244506631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 244506631 = 17 ⋅14382743.

It can be written as a sum of positive squares in only one way, i.e., 69872881 + 66732561 = 8359^2 + 8169^2 .

It is a super-2 number, since 2×136605442² = 37322093568030728, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34151359 + ... + 34151362.

Almost surely, 2^136605442 is an apocalyptic number.

136605442 is a deficient number, since it is larger than the sum of its proper divisors (68302724).

136605442 is an equidigital number, since it uses as much as digits as its factorization.

136605442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68302723.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 136605442 is about 11687.8330754678. The cubic root of 136605442 is about 515.0183070754.

The spelling of 136605442 in words is "one hundred thirty-six million, six hundred five thousand, four hundred forty-two".