320145761 has 16 divisors (see below), whose sum is σ = 357504000. Its totient is φ = 284655168.

The previous prime is 320145757. The next prime is 320145767. The reversal of 320145761 is 167541023.

It is a cyclic number.

It is not a de Polignac number, because 320145761 - 2² = 320145757 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320145767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 228140 + ... + 229538.

It is an arithmetic number, because the mean of its divisors is an integer number (22344000).

Almost surely, 2^320145761 is an apocalyptic number.

It is an amenable number.

320145761 is a deficient number, since it is larger than the sum of its proper divisors (37358239).

320145761 is a wasteful number, since it uses less digits than its factorization.

320145761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2048.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 320145761 is about 17892.6174999635. The cubic root of 320145761 is about 684.0942161578.

Adding to 320145761 its reverse (167541023), we get a palindrome (487686784).

The spelling of 320145761 in words is "three hundred twenty million, one hundred forty-five thousand, seven hundred sixty-one".