161708401 has 4 divisors (see below), whose sum is σ = 161766900. Its totient is φ = 161649904.

The previous prime is 161708399. The next prime is 161708419. The reversal of 161708401 is 104807161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 104807161 = 113 ⋅927497.

It can be written as a sum of positive squares in 2 ways, for example, as 59213025 + 102495376 = 7695^2 + 10124^2 .

It is a cyclic number.

It is not a de Polignac number, because 161708401 - 2¹ = 161708399 is a prime.

It is a super-3 number, since 3×161708401³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161708401.

It is not an unprimeable number, because it can be changed into a prime (161708201) 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, 24886 + ... + 30703.

It is an arithmetic number, because the mean of its divisors is an integer number (40441725).

Almost surely, 2^161708401 is an apocalyptic number.

It is an amenable number.

161708401 is a deficient number, since it is larger than the sum of its proper divisors (58499).

161708401 is an equidigital number, since it uses as much as digits as its factorization.

161708401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58498.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 161708401 is about 12716.4618113688. The cubic root of 161708401 is about 544.8089008205.

The spelling of 161708401 in words is "one hundred sixty-one million, seven hundred eight thousand, four hundred one".