135857917 has 6 divisors (see below), whose sum is σ = 147112602. Its totient is φ = 125407152.

The previous prime is 135857899. The next prime is 135857929. The reversal of 135857917 is 719758531.

It can be written as a sum of positive squares in 3 ways, for example, as 8145316 + 127712601 = 2854^2 + 11301^2 .

It is not a de Polignac number, because 135857917 - 2¹⁵ = 135825149 is a prime.

It is a super-2 number, since 2×135857917² = 36914747223157778, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135857317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 401778 + ... + 402115.

It is an arithmetic number, because the mean of its divisors is an integer number (24518767).

Almost surely, 2^135857917 is an apocalyptic number.

It is an amenable number.

135857917 is a deficient number, since it is larger than the sum of its proper divisors (11254685).

135857917 is an equidigital number, since it uses as much as digits as its factorization.

135857917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803919 (or 803906 counting only the distinct ones).

The product of its digits is 264600, while the sum is 46.

The square root of 135857917 is about 11655.8104394332. The cubic root of 135857917 is about 514.0771697486.

The spelling of 135857917 in words is "one hundred thirty-five million, eight hundred fifty-seven thousand, nine hundred seventeen".