1242135403 has 2 divisors, whose sum is σ = 1242135404. Its totient is φ = 1242135402.

The previous prime is 1242135361. The next prime is 1242135443. The reversal of 1242135403 is 3045312421.

It is a strong prime.

It is an emirp because it is prime and its reverse (3045312421) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242135403 is a prime.

It is not a weakly prime, because it can be changed into another prime (1242135443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621067701 + 621067702.

It is an arithmetic number, because the mean of its divisors is an integer number (621067702).

Almost surely, 2^1242135403 is an apocalyptic number.

1242135403 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242135403 is an equidigital number, since it uses as much as digits as its factorization.

1242135403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 1242135403 is about 35243.9413658575. The cubic root of 1242135403 is about 1074.9534223194.

Adding to 1242135403 its reverse (3045312421), we get a palindrome (4287447824).

The spelling of 1242135403 in words is "one billion, two hundred forty-two million, one hundred thirty-five thousand, four hundred three".