161411905 has 16 divisors (see below), whose sum is σ = 197510400. Its totient is φ = 126597760.

The previous prime is 161411881. The next prime is 161411933. The reversal of 161411905 is 509114161.

It is not a de Polignac number, because 161411905 - 2¹⁵ = 161379137 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 211725 + ... + 212485.

It is an arithmetic number, because the mean of its divisors is an integer number (12344400).

Almost surely, 2^161411905 is an apocalyptic number.

It is an amenable number.

161411905 is a deficient number, since it is larger than the sum of its proper divisors (36098495).

161411905 is an equidigital number, since it uses as much as digits as its factorization.

161411905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544.

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 161411905 is about 12704.7985029279. The cubic root of 161411905 is about 544.4757239730.

The spelling of 161411905 in words is "one hundred sixty-one million, four hundred eleven thousand, nine hundred five".