161356190 has 8 divisors (see below), whose sum is σ = 290441160. Its totient is φ = 64542472.

The previous prime is 161356171. The next prime is 161356193. The reversal of 161356190 is 91653161.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×161356190² = 52071640102632200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161356193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8067800 + ... + 8067819.

It is an arithmetic number, because the mean of its divisors is an integer number (36305145).

Almost surely, 2^161356190 is an apocalyptic number.

161356190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161356190 is a deficient number, since it is larger than the sum of its proper divisors (129084970).

161356190 is a wasteful number, since it uses less digits than its factorization.

161356190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16135626.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 161356190 is about 12702.6056382145. The cubic root of 161356190 is about 544.4130706928.

The spelling of 161356190 in words is "one hundred sixty-one million, three hundred fifty-six thousand, one hundred ninety".