161022000 has 160 divisors (see below), whose sum is σ = 531108864. Its totient is φ = 41952000.

The previous prime is 161021957. The next prime is 161022019. The reversal of 161022000 is 220161.

It is a Harshad number since it is a multiple of its sum of digits (12).

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, 281715 + ... + 282285.

Almost surely, 2^161022000 is an apocalyptic number.

161022000 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 161022000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (265554432).

161022000 is an abundant number, since it is smaller than the sum of its proper divisors (370086864).

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

161022000 is a wasteful number, since it uses less digits than its factorization.

161022000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644 (or 628 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 161022000 is about 12689.4444322831. Note that the first 4 decimals coincide. The cubic root of 161022000 is about 544.0369604357.

Adding to 161022000 its reverse (220161), we get a palindrome (161242161).

The spelling of 161022000 in words is "one hundred sixty-one million, twenty-two thousand".