1312020403 has 2 divisors, whose sum is σ = 1312020404. Its totient is φ = 1312020402.

The previous prime is 1312020397. The next prime is 1312020419. The reversal of 1312020403 is 3040202131.

It is a happy number.

It is an a-pointer prime, because the next prime (1312020419) can be obtained adding 1312020403 to its sum of digits (16).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1312020403 - 2⁵ = 1312020371 is a prime.

It is not a weakly prime, because it can be changed into another prime (1312020443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656010201 + 656010202.

It is an arithmetic number, because the mean of its divisors is an integer number (656010202).

Almost surely, 2^1312020403 is an apocalyptic number.

1312020403 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312020403 is an equidigital number, since it uses as much as digits as its factorization.

1312020403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1312020403 is about 36221.8221932580. The cubic root of 1312020403 is about 1094.7464097258.

Adding to 1312020403 its reverse (3040202131), we get a palindrome (4352222534).

The spelling of 1312020403 in words is "one billion, three hundred twelve million, twenty thousand, four hundred three".