1243188139 has 2 divisors, whose sum is σ = 1243188140. Its totient is φ = 1243188138.

The previous prime is 1243188119. The next prime is 1243188151. The reversal of 1243188139 is 9318813421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1243188139 - 2¹³ = 1243179947 is a prime.

It is not a weakly prime, because it can be changed into another prime (1243188119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621594069 + 621594070.

It is an arithmetic number, because the mean of its divisors is an integer number (621594070).

Almost surely, 2^1243188139 is an apocalyptic number.

1243188139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243188139 is an equidigital number, since it uses as much as digits as its factorization.

1243188139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 40.

The square root of 1243188139 is about 35258.8731952682. The cubic root of 1243188139 is about 1075.2570184804.

The spelling of 1243188139 in words is "one billion, two hundred forty-three million, one hundred eighty-eight thousand, one hundred thirty-nine".