135620557 has 4 divisors (see below), whose sum is σ = 135785376. Its totient is φ = 135455740.

The previous prime is 135620549. The next prime is 135620561. The reversal of 135620557 is 755026531.

135620557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 135620557 - 2³ = 135620549 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 (135620657) 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, 81169 + ... + 82822.

It is an arithmetic number, because the mean of its divisors is an integer number (33946344).

Almost surely, 2^135620557 is an apocalyptic number.

It is an amenable number.

135620557 is a deficient number, since it is larger than the sum of its proper divisors (164819).

135620557 is an equidigital number, since it uses as much as digits as its factorization.

135620557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164818.

The product of its (nonzero) digits is 31500, while the sum is 34.

The square root of 135620557 is about 11645.6239420651. The cubic root of 135620557 is about 513.7776104965. Note that the first 3 decimals are identical.

The spelling of 135620557 in words is "one hundred thirty-five million, six hundred twenty thousand, five hundred fifty-seven".