161860801 has 4 divisors (see below), whose sum is σ = 162699652. Its totient is φ = 161021952.

The previous prime is 161860771. The next prime is 161860819. The reversal of 161860801 is 108068161.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11553201 + 150307600 = 3399^2 + 12260^2 .

It is a cyclic number.

It is not a de Polignac number, because 161860801 - 2⁹ = 161860289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161860841) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 419136 + ... + 419521.

It is an arithmetic number, because the mean of its divisors is an integer number (40674913).

Almost surely, 2^161860801 is an apocalyptic number.

It is an amenable number.

161860801 is a deficient number, since it is larger than the sum of its proper divisors (838851).

161860801 is an equidigital number, since it uses as much as digits as its factorization.

161860801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838850.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 161860801 is about 12722.4526330421. The cubic root of 161860801 is about 544.9799964602.

The spelling of 161860801 in words is "one hundred sixty-one million, eight hundred sixty thousand, eight hundred one".