1281139103 has 2 divisors, whose sum is σ = 1281139104. Its totient is φ = 1281139102.

The previous prime is 1281139081. The next prime is 1281139117. The reversal of 1281139103 is 3019311821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1281139103 - 2¹² = 1281135007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1281132103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640569551 + 640569552.

It is an arithmetic number, because the mean of its divisors is an integer number (640569552).

Almost surely, 2^1281139103 is an apocalyptic number.

1281139103 is a deficient number, since it is larger than the sum of its proper divisors (1).

1281139103 is an equidigital number, since it uses as much as digits as its factorization.

1281139103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 1281139103 is about 35793.0035481796. The cubic root of 1281139103 is about 1086.0890346055.

The spelling of 1281139103 in words is "one billion, two hundred eighty-one million, one hundred thirty-nine thousand, one hundred three".