135642557 has 4 divisors (see below), whose sum is σ = 135665856. Its totient is φ = 135619260.

The previous prime is 135642527. The next prime is 135642571. The reversal of 135642557 is 755246531.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 755246531 = 13 ⋅58095887.

It is a cyclic number.

It is not a de Polignac number, because 135642557 - 2⁸ = 135642301 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 135642557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135642527) 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, 5468 + ... + 17354.

It is an arithmetic number, because the mean of its divisors is an integer number (33916464).

Almost surely, 2^135642557 is an apocalyptic number.

It is an amenable number.

135642557 is a deficient number, since it is larger than the sum of its proper divisors (23299).

135642557 is a wasteful number, since it uses less digits than its factorization.

135642557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23298.

The product of its digits is 126000, while the sum is 38.

The square root of 135642557 is about 11646.5684645736. The cubic root of 135642557 is about 513.8053901993.

The spelling of 135642557 in words is "one hundred thirty-five million, six hundred forty-two thousand, five hundred fifty-seven".