161743401 has 12 divisors (see below), whose sum is σ = 239328180. Its totient is φ = 105198720.

The previous prime is 161743381. The next prime is 161743459. The reversal of 161743401 is 104347161.

It is a happy number.

161743401 is a `hidden beast` number, since 1 + 617 + 4 + 3 + 40 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 70560000 + 91183401 = 8400^2 + 9549^2 .

It is not a de Polignac number, because 161743401 - 2¹³ = 161735209 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161743471) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 218796 + ... + 219533.

It is an arithmetic number, because the mean of its divisors is an integer number (19944015).

Almost surely, 2^161743401 is an apocalyptic number.

It is an amenable number.

161743401 is a deficient number, since it is larger than the sum of its proper divisors (77584779).

161743401 is a wasteful number, since it uses less digits than its factorization.

161743401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438376 (or 438373 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 161743401 is about 12717.8379058706. The cubic root of 161743401 is about 544.8482039444.

The spelling of 161743401 in words is "one hundred sixty-one million, seven hundred forty-three thousand, four hundred one".