135406213 has 4 divisors (see below), whose sum is σ = 135635148. Its totient is φ = 135177280.

The previous prime is 135406189. The next prime is 135406223. The reversal of 135406213 is 312604531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 312604531 = 127 ⋅2461453.

It can be written as a sum of positive squares in 2 ways, for example, as 86434209 + 48972004 = 9297^2 + 6998^2 .

It is a cyclic number.

It is not a de Polignac number, because 135406213 - 2⁹ = 135405701 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 (135406223) 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, 113578 + ... + 114763.

It is an arithmetic number, because the mean of its divisors is an integer number (33908787).

Almost surely, 2^135406213 is an apocalyptic number.

It is an amenable number.

135406213 is a deficient number, since it is larger than the sum of its proper divisors (228935).

135406213 is an equidigital number, since it uses as much as digits as its factorization.

135406213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228934.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 135406213 is about 11636.4175329008. The cubic root of 135406213 is about 513.5067980228.

The spelling of 135406213 in words is "one hundred thirty-five million, four hundred six thousand, two hundred thirteen".