320401161 has 24 divisors (see below), whose sum is σ = 493852320. Its totient is φ = 199578816.

The previous prime is 320401141. The next prime is 320401171. The reversal of 320401161 is 161104023.

It is a happy number.

It is not a de Polignac number, because 320401161 - 2⁷ = 320401033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (320401111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 351 + ... + 25316.

It is an arithmetic number, because the mean of its divisors is an integer number (20577180).

Almost surely, 2^320401161 is an apocalyptic number.

It is an amenable number.

320401161 is a deficient number, since it is larger than the sum of its proper divisors (173451159).

320401161 is a wasteful number, since it uses less digits than its factorization.

320401161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25765 (or 25762 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 320401161 is about 17899.7530988559. The cubic root of 320401161 is about 684.2760825071.

Adding to 320401161 its reverse (161104023), we get a palindrome (481505184).

The spelling of 320401161 in words is "three hundred twenty million, four hundred one thousand, one hundred sixty-one".