320771257 has 4 divisors (see below), whose sum is σ = 320889060. Its totient is φ = 320653456.

The previous prime is 320771251. The next prime is 320771261. The reversal of 320771257 is 752177023.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 752177023 = 13 ⋅57859771.

It can be written as a sum of positive squares in 2 ways, for example, as 262569616 + 58201641 = 16204^2 + 7629^2 .

It is a cyclic number.

It is not a de Polignac number, because 320771257 - 2¹⁵ = 320738489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320771251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54718 + ... + 60295.

It is an arithmetic number, because the mean of its divisors is an integer number (80222265).

Almost surely, 2^320771257 is an apocalyptic number.

It is an amenable number.

320771257 is a deficient number, since it is larger than the sum of its proper divisors (117803).

320771257 is a wasteful number, since it uses less digits than its factorization.

320771257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117802.

The product of its (nonzero) digits is 20580, while the sum is 34.

The square root of 320771257 is about 17910.0881349032. The cubic root of 320771257 is about 684.5394506690.

The spelling of 320771257 in words is "three hundred twenty million, seven hundred seventy-one thousand, two hundred fifty-seven".