135561984 has 72 divisors (see below), whose sum is σ = 363014400. Its totient is φ = 44909568.

The previous prime is 135561983. The next prime is 135561989. The reversal of 135561984 is 489165531.

It is not an unprimeable number, because it can be changed into a prime (135561983) 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, 152389 + ... + 153275.

Almost surely, 2^135561984 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 135561984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (181507200).

135561984 is an abundant number, since it is smaller than the sum of its proper divisors (227452416).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

135561984 is an equidigital number, since it uses as much as digits as its factorization.

135561984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105 (or 1091 counting only the distinct ones).

The product of its digits is 129600, while the sum is 42.

The square root of 135561984 is about 11643.1088631860. The cubic root of 135561984 is about 513.7036349133.

The spelling of 135561984 in words is "one hundred thirty-five million, five hundred sixty-one thousand, nine hundred eighty-four".