161031600 has 180 divisors, whose sum is σ = 572978952. Its totient is φ = 41856000.

The previous prime is 161031589. The next prime is 161031623. The reversal of 161031600 is 6130161.

161031600 is a `hidden beast` number, since 1 + 61 + 0 + 3 + 1 + 600 = 666.

It is a tau number, because it is divible by the number of its divisors (180).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 147055 + ... + 148145.

Almost surely, 2^161031600 is an apocalyptic number.

161031600 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 161031600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (286489476).

161031600 is an abundant number, since it is smaller than the sum of its proper divisors (411947352).

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

161031600 is a wasteful number, since it uses less digits than its factorization.

161031600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156 (or 1142 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 161031600 is about 12689.8226937968. The cubic root of 161031600 is about 544.0477719005.

Adding to 161031600 its reverse (6130161), we get a palindrome (167161761).

The spelling of 161031600 in words is "one hundred sixty-one million, thirty-one thousand, six hundred".