135494021 has 4 divisors (see below), whose sum is σ = 145916652. Its totient is φ = 125071392.

The previous prime is 135493987. The next prime is 135494069. The reversal of 135494021 is 120494531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37761025 + 97732996 = 6145^2 + 9886^2 .

It is a cyclic number.

It is not a de Polignac number, because 135494021 - 2¹⁰ = 135492997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135494071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5211296 + ... + 5211321.

It is an arithmetic number, because the mean of its divisors is an integer number (36479163).

Almost surely, 2^135494021 is an apocalyptic number.

It is an amenable number.

135494021 is a deficient number, since it is larger than the sum of its proper divisors (10422631).

135494021 is a wasteful number, since it uses less digits than its factorization.

135494021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10422630.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 135494021 is about 11640.1899039492. The cubic root of 135494021 is about 513.6177733879.

The spelling of 135494021 in words is "one hundred thirty-five million, four hundred ninety-four thousand, twenty-one".