1311302173 has 2 divisors, whose sum is σ = 1311302174. Its totient is φ = 1311302172.

The previous prime is 1311302171. The next prime is 1311302281. The reversal of 1311302173 is 3712031131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1185906969 + 125395204 = 34437^2 + 11198^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311302173 - 2¹ = 1311302171 is a prime.

Together with 1311302171, 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 (1311302171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655651086 + 655651087.

It is an arithmetic number, because the mean of its divisors is an integer number (655651087).

Almost surely, 2^1311302173 is an apocalyptic number.

It is an amenable number.

1311302173 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311302173 is an equidigital number, since it uses as much as digits as its factorization.

1311302173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 1311302173 is about 36211.9065087714. The cubic root of 1311302173 is about 1094.5466101821.

The spelling of 1311302173 in words is "one billion, three hundred eleven million, three hundred two thousand, one hundred seventy-three".