161810000 has 100 divisors (see below), whose sum is σ = 427663104. Its totient is φ = 58800000.

The previous prime is 161809981. The next prime is 161810017. The reversal of 161810000 is 18161.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (100).

It is a super-2 number, since 2×161810000² = 52364952200000000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 109265 + ... + 110735.

Almost surely, 2^161810000 is an apocalyptic number.

161810000 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 161810000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (213831552).

161810000 is an abundant number, since it is smaller than the sum of its proper divisors (265853104).

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

161810000 is a wasteful number, since it uses less digits than its factorization.

161810000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1510 (or 1489 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 17.

The square root of 161810000 is about 12720.4559666704. The cubic root of 161810000 is about 544.9229753953.

Adding to 161810000 its reverse (18161), we get a palindrome (161828161).

The spelling of 161810000 in words is "one hundred sixty-one million, eight hundred ten thousand".