161910 has 48 divisors (see below), whose sum is σ = 482976. Its totient is φ = 36864.

The previous prime is 161881. The next prime is 161911. The reversal of 161910 is 19161.

It is a super-3 number, since 3×161910³ = 12733338167613000, which contains 333 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161911) by changing a digit.

161910 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 502 + ... + 758.

It is an arithmetic number, because the mean of its divisors is an integer number (10062).

2¹⁶¹⁹¹⁰ is an apocalyptic number.

161910 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161910, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (241488).

161910 is an abundant number, since it is smaller than the sum of its proper divisors (321066).

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

161910 is a wasteful number, since it uses less digits than its factorization.

161910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277 (or 274 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 18.

The square root of 161910 is about 402.3804170185. The cubic root of 161910 is about 54.5035208005.

The spelling of 161910 in words is "one hundred sixty-one thousand, nine hundred ten".