135698549 has 4 divisors (see below), whose sum is σ = 155084064. Its totient is φ = 116313036.

The previous prime is 135698527. The next prime is 135698579. The reversal of 135698549 is 945896531.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 945896531 = 647 ⋅1461973.

It is not a de Polignac number, because 135698549 - 2⁸ = 135698293 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 135698497 and 135698506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135698579) 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, 9692747 + ... + 9692760.

It is an arithmetic number, because the mean of its divisors is an integer number (38771016).

Almost surely, 2^135698549 is an apocalyptic number.

It is an amenable number.

135698549 is a deficient number, since it is larger than the sum of its proper divisors (19385515).

135698549 is an equidigital number, since it uses as much as digits as its factorization.

135698549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19385514.

The product of its digits is 1166400, while the sum is 50.

The square root of 135698549 is about 11648.9720147316. The cubic root of 135698549 is about 513.8760785202.

The spelling of 135698549 in words is "one hundred thirty-five million, six hundred ninety-eight thousand, five hundred forty-nine".