161004100 has 72 divisors (see below), whose sum is σ = 371851200. Its totient is φ = 60336000.

The previous prime is 161004091. The next prime is 161004101. The reversal of 161004100 is 1400161.

It is not an unprimeable number, because it can be changed into a prime (161004101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 191481 + ... + 192319.

It is an arithmetic number, because the mean of its divisors is an integer number (5164600).

Almost surely, 2^161004100 is an apocalyptic number.

161004100 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 161004100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185925600).

161004100 is an abundant number, since it is smaller than the sum of its proper divisors (210847100).

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

161004100 is a wasteful number, since it uses less digits than its factorization.

161004100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 973 (or 966 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 161004100 is about 12688.7391020542. The cubic root of 161004100 is about 544.0168004111.

Adding to 161004100 its reverse (1400161), we get a palindrome (162404261).

The spelling of 161004100 in words is "one hundred sixty-one million, four thousand, one hundred".