1231306603 has 2 divisors, whose sum is σ = 1231306604. Its totient is φ = 1231306602.

The previous prime is 1231306589. The next prime is 1231306607. The reversal of 1231306603 is 3066031321.

It is a strong prime.

It is an emirp because it is prime and its reverse (3066031321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231306603 - 2²¹ = 1229209451 is a prime.

It is a super-2 number, since 2×1231306603² = 3032231901182799218, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1231306607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615653301 + 615653302.

It is an arithmetic number, because the mean of its divisors is an integer number (615653302).

Almost surely, 2^1231306603 is an apocalyptic number.

1231306603 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231306603 is an equidigital number, since it uses as much as digits as its factorization.

1231306603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 1231306603 is about 35089.9786691300. The cubic root of 1231306603 is about 1071.8205252349.

Adding to 1231306603 its reverse (3066031321), we get a palindrome (4297337924).

The spelling of 1231306603 in words is "one billion, two hundred thirty-one million, three hundred six thousand, six hundred three".