1310320261 has 2 divisors, whose sum is σ = 1310320262. Its totient is φ = 1310320260.

The previous prime is 1310320259. The next prime is 1310320337. The reversal of 1310320261 is 1620230131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1096868161 + 213452100 = 33119^2 + 14610^2 .

It is a cyclic number.

It is not a de Polignac number, because 1310320261 - 2¹ = 1310320259 is a prime.

Together with 1310320259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1310321261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655160130 + 655160131.

It is an arithmetic number, because the mean of its divisors is an integer number (655160131).

Almost surely, 2^1310320261 is an apocalyptic number.

It is an amenable number.

1310320261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1310320261 is an equidigital number, since it uses as much as digits as its factorization.

1310320261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1310320261 is about 36198.3461086277. The cubic root of 1310320261 is about 1094.2733406428.

Adding to 1310320261 its reverse (1620230131), we get a palindrome (2930550392).

The spelling of 1310320261 in words is "one billion, three hundred ten million, three hundred twenty thousand, two hundred sixty-one".