135891517 has 4 divisors (see below), whose sum is σ = 136501120. Its totient is φ = 135281916.

The previous prime is 135891451. The next prime is 135891527. The reversal of 135891517 is 715198531.

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: 715198531 = 59 ⋅12122009.

It is a cyclic number.

It is not a de Polignac number, because 135891517 - 2²³ = 127502909 is a prime.

It is a super-2 number, since 2×135891517² = 36933008785122578, which contains 22 as substring.

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 135891517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135891527) 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, 304467 + ... + 304912.

It is an arithmetic number, because the mean of its divisors is an integer number (34125280).

Almost surely, 2^135891517 is an apocalyptic number.

It is an amenable number.

135891517 is a deficient number, since it is larger than the sum of its proper divisors (609603).

135891517 is an equidigital number, since it uses as much as digits as its factorization.

135891517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609602.

The product of its digits is 37800, while the sum is 40.

The square root of 135891517 is about 11657.2516915438. The cubic root of 135891517 is about 514.1195462978.

The spelling of 135891517 in words is "one hundred thirty-five million, eight hundred ninety-one thousand, five hundred seventeen".