393320161 has 4 divisors (see below), whose sum is σ = 423575572. Its totient is φ = 363064752.

The previous prime is 393320113. The next prime is 393320189. The reversal of 393320161 is 161023393.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 161023393 = 31 ⋅5194303.

It can be written as a sum of positive squares in 2 ways, for example, as 245235600 + 148084561 = 15660^2 + 12169^2 .

It is a cyclic number.

It is not a de Polignac number, because 393320161 - 2¹³ = 393311969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (393320461) 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, 15127686 + ... + 15127711.

It is an arithmetic number, because the mean of its divisors is an integer number (105893893).

Almost surely, 2^393320161 is an apocalyptic number.

It is an amenable number.

393320161 is a deficient number, since it is larger than the sum of its proper divisors (30255411).

393320161 is a wasteful number, since it uses less digits than its factorization.

393320161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30255410.

The product of its (nonzero) digits is 2916, while the sum is 28.

The square root of 393320161 is about 19832.3009507218. The cubic root of 393320161 is about 732.6817984229.

The spelling of 393320161 in words is "three hundred ninety-three million, three hundred twenty thousand, one hundred sixty-one".