1313123173 has 2 divisors, whose sum is σ = 1313123174. Its totient is φ = 1313123172.

The previous prime is 1313123159. The next prime is 1313123179. The reversal of 1313123173 is 3713213131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 787475844 + 525647329 = 28062^2 + 22927^2 .

It is an emirp because it is prime and its reverse (3713213131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1313123173 - 2¹³ = 1313114981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1313123179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656561586 + 656561587.

It is an arithmetic number, because the mean of its divisors is an integer number (656561587).

Almost surely, 2^1313123173 is an apocalyptic number.

It is an amenable number.

1313123173 is a deficient number, since it is larger than the sum of its proper divisors (1).

1313123173 is an equidigital number, since it uses as much as digits as its factorization.

1313123173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1134, while the sum is 25.

The square root of 1313123173 is about 36237.0414493236. The cubic root of 1313123173 is about 1095.0530399723.

The spelling of 1313123173 in words is "one billion, three hundred thirteen million, one hundred twenty-three thousand, one hundred seventy-three".