161232500 has 180 divisors, whose sum is σ = 427541268. Its totient is φ = 52800000.

The previous prime is 161232493. The next prime is 161232517. The reversal of 161232500 is 5232161.

161232500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 10 ways, for example, as 161137636 + 94864 = 12694^2 + 308^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 3932480 + ... + 3932520.

Almost surely, 2^161232500 is an apocalyptic number.

161232500 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 161232500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (213770634).

161232500 is an abundant number, since it is smaller than the sum of its proper divisors (266308768).

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

161232500 is a wasteful number, since it uses less digits than its factorization.

161232500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100 (or 72 counting only the distinct ones).

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

The square root of 161232500 is about 12697.7360186767. The cubic root of 161232500 is about 544.2739258058.

Adding to 161232500 its reverse (5232161), we get a palindrome (166464661).

The spelling of 161232500 in words is "one hundred sixty-one million, two hundred thirty-two thousand, five hundred".