135522991 has 8 divisors (see below), whose sum is σ = 142963200. Its totient is φ = 128113560.

The previous prime is 135522983. The next prime is 135523019. The reversal of 135522991 is 199225531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 135522991 - 2³ = 135522983 is a prime.

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 135522991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135522901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1656 + ... + 16546.

It is an arithmetic number, because the mean of its divisors is an integer number (17870400).

Almost surely, 2^135522991 is an apocalyptic number.

135522991 is a deficient number, since it is larger than the sum of its proper divisors (7440209).

135522991 is a wasteful number, since it uses less digits than its factorization.

135522991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15389.

The product of its digits is 24300, while the sum is 37.

The square root of 135522991 is about 11641.4342329457. The cubic root of 135522991 is about 513.6543763476.

The spelling of 135522991 in words is "one hundred thirty-five million, five hundred twenty-two thousand, nine hundred ninety-one".