161322810 has 64 divisors (see below), whose sum is σ = 423722880. Its totient is φ = 38983680.

The previous prime is 161322803. The next prime is 161322827. The reversal of 161322810 is 18223161.

It is a super-2 number, since 2×161322810² = 52050098052592200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 142326 + ... + 143454.

It is an arithmetic number, because the mean of its divisors is an integer number (6620670).

Almost surely, 2^161322810 is an apocalyptic number.

161322810 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 161322810, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211861440).

161322810 is an abundant number, since it is smaller than the sum of its proper divisors (262400070).

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

161322810 is a wasteful number, since it uses less digits than its factorization.

161322810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1583.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 161322810 is about 12701.2916665983. The cubic root of 161322810 is about 544.3755269176.

Adding to 161322810 its reverse (18223161), we get a palindrome (179545971).

The spelling of 161322810 in words is "one hundred sixty-one million, three hundred twenty-two thousand, eight hundred ten".