161000190 has 64 divisors (see below), whose sum is σ = 462369600. Its totient is φ = 39629952.

The previous prime is 161000173. The next prime is 161000197. The reversal of 161000190 is 91000161.

It is a super-2 number, since 2×161000190² = 51842122360072200, which contains 22 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 (161000197) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19425 + ... + 26444.

It is an arithmetic number, because the mean of its divisors is an integer number (7224525).

Almost surely, 2^161000190 is an apocalyptic number.

161000190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161000190 is an abundant number, since it is smaller than the sum of its proper divisors (301369410).

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

161000190 is a wasteful number, since it uses less digits than its factorization.

161000190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45898 (or 45892 counting only the distinct ones).

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

The square root of 161000190 is about 12688.5850274962. The cubic root of 161000190 is about 544.0123965420.

The spelling of 161000190 in words is "one hundred sixty-one million, one hundred ninety", and thus it is an aban number.