161430500 has 144 divisors (see below), whose sum is σ = 448156800. Its totient is φ = 50232000.

The previous prime is 161430497. The next prime is 161430509. The reversal of 161430500 is 5034161.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (161430509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 269201 + ... + 269799.

It is an arithmetic number, because the mean of its divisors is an integer number (3112200).

Almost surely, 2^161430500 is an apocalyptic number.

161430500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161430500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (224078400).

161430500 is an abundant number, since it is smaller than the sum of its proper divisors (286726300).

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

161430500 is a wasteful number, since it uses less digits than its factorization.

161430500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643 (or 624 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 161430500 is about 12705.5302919634. The cubic root of 161430500 is about 544.4966314299.

Adding to 161430500 its reverse (5034161), we get a palindrome (166464661).

The spelling of 161430500 in words is "one hundred sixty-one million, four hundred thirty thousand, five hundred".