135991564 has 12 divisors (see below), whose sum is σ = 238334488. Its totient is φ = 67896000.

The previous prime is 135991529. The next prime is 135991567. The reversal of 135991564 is 465199531.

It is a self number, because there is not a number n which added to its sum of digits gives 135991564.

It is not an unprimeable number, because it can be changed into a prime (135991567) 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, 21837 + ... + 27364.

Almost surely, 2^135991564 is an apocalyptic number.

It is an amenable number.

135991564 is a deficient number, since it is larger than the sum of its proper divisors (102342924).

135991564 is a wasteful number, since it uses less digits than its factorization.

135991564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49896 (or 49894 counting only the distinct ones).

The product of its digits is 145800, while the sum is 43.

The square root of 135991564 is about 11661.5420935655. The cubic root of 135991564 is about 514.2456849061.

The spelling of 135991564 in words is "one hundred thirty-five million, nine hundred ninety-one thousand, five hundred sixty-four".