161047500 has 120 divisors (see below), whose sum is σ = 476285040. Its totient is φ = 42336000.

The previous prime is 161047493. The next prime is 161047501. The reversal of 161047500 is 5740161.

161047500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (161047501) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 817402 + ... + 817598.

It is an arithmetic number, because the mean of its divisors is an integer number (3969042).

Almost surely, 2^161047500 is an apocalyptic number.

161047500 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 161047500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (238142520).

161047500 is an abundant number, since it is smaller than the sum of its proper divisors (315237540).

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

161047500 is a wasteful number, since it uses less digits than its factorization.

161047500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333 (or 316 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 161047500 is about 12690.4491646277. The cubic root of 161047500 is about 544.0656774438.

Adding to 161047500 its reverse (5740161), we get a palindrome (166787661).

The spelling of 161047500 in words is "one hundred sixty-one million, forty-seven thousand, five hundred".