135445538 has 4 divisors (see below), whose sum is σ = 203168310. Its totient is φ = 67722768.

The previous prime is 135445537. The next prime is 135445543. The reversal of 135445538 is 835544531.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 835544531 = 5693 ⋅146767.

It can be written as a sum of positive squares in only one way, i.e., 90193009 + 45252529 = 9497^2 + 6727^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (135445537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33861383 + ... + 33861386.

Almost surely, 2^135445538 is an apocalyptic number.

135445538 is a deficient number, since it is larger than the sum of its proper divisors (67722772).

135445538 is an equidigital number, since it uses as much as digits as its factorization.

135445538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67722771.

The product of its digits is 144000, while the sum is 38.

The square root of 135445538 is about 11638.1071485014. The cubic root of 135445538 is about 513.5565045067.

The spelling of 135445538 in words is "one hundred thirty-five million, four hundred forty-five thousand, five hundred thirty-eight".