161544100 has 81 divisors (see below), whose sum is σ = 371273763. Its totient is φ = 61008000.

The previous prime is 161544049. The next prime is 161544101. The reversal of 161544100 is 1445161.

The square root of 161544100 is 12710.

It is a perfect power (a square), and thus also a powerful number.

161544100 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 4 ways, for example, as 67996516 + 93547584 = 8246^2 + 9672^2 .

It is a super-3 number, since 3×161544100³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (161544101) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3940080 + ... + 3940120.

Almost surely, 2^161544100 is an apocalyptic number.

161544100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161544100 is the 12710-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161544100

161544100 is an abundant number, since it is smaller than the sum of its proper divisors (209729663).

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

161544100 is a wasteful number, since it uses less digits than its factorization.

161544100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158 (or 79 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The cubic root of 161544100 is about 544.6243237675.

Adding to 161544100 its reverse (1445161), we get a palindrome (162989261).

The spelling of 161544100 in words is "one hundred sixty-one million, five hundred forty-four thousand, one hundred".