320540137 has 2 divisors, whose sum is σ = 320540138. Its totient is φ = 320540136.

The previous prime is 320540119. The next prime is 320540183. The reversal of 320540137 is 731045023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 183087961 + 137452176 = 13531^2 + 11724^2 .

It is an emirp because it is prime and its reverse (731045023) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320540137 is a prime.

It is not a weakly prime, because it can be changed into another prime (320540537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160270068 + 160270069.

It is an arithmetic number, because the mean of its divisors is an integer number (160270069).

Almost surely, 2^320540137 is an apocalyptic number.

It is an amenable number.

320540137 is a deficient number, since it is larger than the sum of its proper divisors (1).

320540137 is an equidigital number, since it uses as much as digits as its factorization.

320540137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 320540137 is about 17903.6347426996. The cubic root of 320540137 is about 684.3750045440.

The spelling of 320540137 in words is "three hundred twenty million, five hundred forty thousand, one hundred thirty-seven".