1243011139 has 2 divisors, whose sum is σ = 1243011140. Its totient is φ = 1243011138.

The previous prime is 1243011089. The next prime is 1243011157. The reversal of 1243011139 is 9311103421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1243011139 - 2¹³ = 1243002947 is a prime.

It is not a weakly prime, because it can be changed into another prime (1243011169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621505569 + 621505570.

It is an arithmetic number, because the mean of its divisors is an integer number (621505570).

Almost surely, 2^1243011139 is an apocalyptic number.

1243011139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243011139 is an equidigital number, since it uses as much as digits as its factorization.

1243011139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 1243011139 is about 35256.3630994463. The cubic root of 1243011139 is about 1075.2059858385.

The spelling of 1243011139 in words is "one billion, two hundred forty-three million, eleven thousand, one hundred thirty-nine".