320561457 has 4 divisors (see below), whose sum is σ = 427415280. Its totient is φ = 213707636.

The previous prime is 320561413. The next prime is 320561459. The reversal of 320561457 is 754165023.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 320561457 - 2⁶ = 320561393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (320561459) 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, 53426907 + ... + 53426912.

It is an arithmetic number, because the mean of its divisors is an integer number (106853820).

Almost surely, 2^320561457 is an apocalyptic number.

It is an amenable number.

320561457 is a deficient number, since it is larger than the sum of its proper divisors (106853823).

320561457 is a wasteful number, since it uses less digits than its factorization.

320561457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106853822.

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 320561457 is about 17904.2301426227. The cubic root of 320561457 is about 684.3901774245.

The spelling of 320561457 in words is "three hundred twenty million, five hundred sixty-one thousand, four hundred fifty-seven".