1231263499 has 2 divisors, whose sum is σ = 1231263500. Its totient is φ = 1231263498.

The previous prime is 1231263463. The next prime is 1231263533. The reversal of 1231263499 is 9943621321.

It is a strong prime.

It is an emirp because it is prime and its reverse (9943621321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231263499 - 2²⁷ = 1097045771 is a prime.

It is not a weakly prime, because it can be changed into another prime (1231263409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615631749 + 615631750.

It is an arithmetic number, because the mean of its divisors is an integer number (615631750).

Almost surely, 2^1231263499 is an apocalyptic number.

1231263499 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231263499 is an equidigital number, since it uses as much as digits as its factorization.

1231263499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 40.

The square root of 1231263499 is about 35089.3644713038. The cubic root of 1231263499 is about 1071.8080181169.

The spelling of 1231263499 in words is "one billion, two hundred thirty-one million, two hundred sixty-three thousand, four hundred ninety-nine".