135565994 has 4 divisors (see below), whose sum is σ = 203348994. Its totient is φ = 67782996.

The previous prime is 135565993. The next prime is 135565999. The reversal of 135565994 is 499565531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 499565531 = 151 ⋅3308381.

It can be written as a sum of positive squares in only one way, i.e., 113145769 + 22420225 = 10637^2 + 4735^2 .

It is not an unprimeable number, because it can be changed into a prime (135565993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33891497 + ... + 33891500.

Almost surely, 2^135565994 is an apocalyptic number.

135565994 is a deficient number, since it is larger than the sum of its proper divisors (67783000).

135565994 is an equidigital number, since it uses as much as digits as its factorization.

135565994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67782999.

The product of its digits is 729000, while the sum is 47.

The square root of 135565994 is about 11643.2810667784. The cubic root of 135565994 is about 513.7087000779.

The spelling of 135565994 in words is "one hundred thirty-five million, five hundred sixty-five thousand, nine hundred ninety-four".