1231312259 has 2 divisors, whose sum is σ = 1231312260. Its totient is φ = 1231312258.

The previous prime is 1231312217. The next prime is 1231312273. The reversal of 1231312259 is 9522131321.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231312259 is a prime.

It is a super-2 number, since 2×1231312259² = 3032259758327366162, 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, 615656129 + 615656130.

It is an arithmetic number, because the mean of its divisors is an integer number (615656130).

Almost surely, 2^1231312259 is an apocalyptic number.

1231312259 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231312259 is an equidigital number, since it uses as much as digits as its factorization.

1231312259 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 29.

The square root of 1231312259 is about 35090.0592618479. The cubic root of 1231312259 is about 1071.8221663662.

The spelling of 1231312259 in words is "one billion, two hundred thirty-one million, three hundred twelve thousand, two hundred fifty-nine".