161011530 has 64 divisors (see below), whose sum is σ = 433382400. Its totient is φ = 42534720.

The previous prime is 161011481. The next prime is 161011577. The reversal of 161011530 is 35110161.

161011530 is a `hidden beast` number, since 1 + 610 + 1 + 1 + 53 + 0 = 666.

161011530 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26695 + ... + 32165.

It is an arithmetic number, because the mean of its divisors is an integer number (6771600).

Almost surely, 2^161011530 is an apocalyptic number.

161011530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161011530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (216691200).

161011530 is an abundant number, since it is smaller than the sum of its proper divisors (272370870).

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

161011530 is a wasteful number, since it uses less digits than its factorization.

161011530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5596 (or 5590 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 161011530 is about 12689.0318779645. The cubic root of 161011530 is about 544.0251686921.

Adding to 161011530 its reverse (35110161), we get a palindrome (196121691).

The spelling of 161011530 in words is "one hundred sixty-one million, eleven thousand, five hundred thirty".