1231312273 has 2 divisors, whose sum is σ = 1231312274. Its totient is φ = 1231312272.

The previous prime is 1231312259. The next prime is 1231312279. The reversal of 1231312273 is 3722131321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1159198209 + 72114064 = 34047^2 + 8492^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231312273 - 2¹⁷ = 1231181201 is a prime.

It is a super-2 number, since 2×1231312273² = 3032259827280853058, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1231312279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615656136 + 615656137.

It is an arithmetic number, because the mean of its divisors is an integer number (615656137).

Almost surely, 2^1231312273 is an apocalyptic number.

It is an amenable number.

1231312273 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231312273 is an equidigital number, since it uses as much as digits as its factorization.

1231312273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 25.

The square root of 1231312273 is about 35090.0594613346. The cubic root of 1231312273 is about 1071.8221704284.

Adding to 1231312273 its reverse (3722131321), we get a palindrome (4953443594).

The spelling of 1231312273 in words is "one billion, two hundred thirty-one million, three hundred twelve thousand, two hundred seventy-three".