135974281 has 4 divisors (see below), whose sum is σ = 136966932. Its totient is φ = 134981632.

The previous prime is 135974273. The next prime is 135974323. The reversal of 135974281 is 182479531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 182479531 = 13 ⋅14036887.

It can be written as a sum of positive squares in 2 ways, for example, as 54686025 + 81288256 = 7395^2 + 9016^2 .

It is a cyclic number.

It is not a de Polignac number, because 135974281 - 2³ = 135974273 is a prime.

It is a super-2 number, since 2×135974281² = 36978010186933922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135974231) 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, 496120 + ... + 496393.

It is an arithmetic number, because the mean of its divisors is an integer number (34241733).

Almost surely, 2^135974281 is an apocalyptic number.

It is an amenable number.

135974281 is a deficient number, since it is larger than the sum of its proper divisors (992651).

135974281 is an equidigital number, since it uses as much as digits as its factorization.

135974281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 992650.

The product of its digits is 60480, while the sum is 40.

The square root of 135974281 is about 11660.8010445252. The cubic root of 135974281 is about 514.2238990334.

The spelling of 135974281 in words is "one hundred thirty-five million, nine hundred seventy-four thousand, two hundred eighty-one".