135311573 has 4 divisors (see below), whose sum is σ = 135814860. Its totient is φ = 134808288.

The previous prime is 135311567. The next prime is 135311581. The reversal of 135311573 is 375113531.

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: 375113531 = 13 ⋅28854887.

It can be written as a sum of positive squares in 2 ways, for example, as 2439844 + 132871729 = 1562^2 + 11527^2 .

It is a cyclic number.

It is not a de Polignac number, because 135311573 - 2⁸ = 135311317 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 (135311503) 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, 251240 + ... + 251777.

It is an arithmetic number, because the mean of its divisors is an integer number (33953715).

Almost surely, 2^135311573 is an apocalyptic number.

It is an amenable number.

135311573 is a deficient number, since it is larger than the sum of its proper divisors (503287).

135311573 is an equidigital number, since it uses as much as digits as its factorization.

135311573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503286.

The product of its digits is 4725, while the sum is 29.

The square root of 135311573 is about 11632.3502784261. The cubic root of 135311573 is about 513.3871343603.

The spelling of 135311573 in words is "one hundred thirty-five million, three hundred eleven thousand, five hundred seventy-three".