161960205 has 16 divisors (see below), whose sum is σ = 282694464. Its totient is φ = 78526080.

The previous prime is 161960177. The next prime is 161960233. The reversal of 161960205 is 502069161.

It is an interprime number because it is at equal distance from previous prime (161960177) and next prime (161960233).

It is not a de Polignac number, because 161960205 - 2⁷ = 161960077 is a prime.

It is a super-2 number, since 2×161960205² = 52462216007284050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 490624 + ... + 490953.

It is an arithmetic number, because the mean of its divisors is an integer number (17668404).

Almost surely, 2^161960205 is an apocalyptic number.

161960205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161960205 is a deficient number, since it is larger than the sum of its proper divisors (120734259).

161960205 is a wasteful number, since it uses less digits than its factorization.

161960205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981596.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 161960205 is about 12726.3586700988. The cubic root of 161960205 is about 545.0915369633.

It can be divided in two parts, 161960 and 205, that added together give a triangular number (162165 = T₅₆₉).

The spelling of 161960205 in words is "one hundred sixty-one million, nine hundred sixty thousand, two hundred five".