135169591 has 12 divisors (see below), whose sum is σ = 143359632. Its totient is φ = 127426464.

The previous prime is 135169589. The next prime is 135169607. The reversal of 135169591 is 195961531.

It is not a de Polignac number, because 135169591 - 2¹ = 135169589 is a prime.

It is a super-2 number, since 2×135169591² = 36541636662214562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135169291) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83310 + ... + 84916.

It is an arithmetic number, because the mean of its divisors is an integer number (11946636).

Almost surely, 2^135169591 is an apocalyptic number.

135169591 is a deficient number, since it is larger than the sum of its proper divisors (8190041).

135169591 is a wasteful number, since it uses less digits than its factorization.

135169591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1878 (or 1859 counting only the distinct ones).

The product of its digits is 36450, while the sum is 40.

The square root of 135169591 is about 11626.2457827108. The cubic root of 135169591 is about 513.2075063596.

The spelling of 135169591 in words is "one hundred thirty-five million, one hundred sixty-nine thousand, five hundred ninety-one".