320312749 has 2 divisors, whose sum is σ = 320312750. Its totient is φ = 320312748.

The previous prime is 320312731. The next prime is 320312779. The reversal of 320312749 is 947213023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204061225 + 116251524 = 14285^2 + 10782^2 .

It is a cyclic number.

It is not a de Polignac number, because 320312749 - 2¹¹ = 320310701 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 320312749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320312779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160156374 + 160156375.

It is an arithmetic number, because the mean of its divisors is an integer number (160156375).

Almost surely, 2^320312749 is an apocalyptic number.

It is an amenable number.

320312749 is a deficient number, since it is larger than the sum of its proper divisors (1).

320312749 is an equidigital number, since it uses as much as digits as its factorization.

320312749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 320312749 is about 17897.2832854598. The cubic root of 320312749 is about 684.2131366444.

The spelling of 320312749 in words is "three hundred twenty million, three hundred twelve thousand, seven hundred forty-nine".