1279389173939 has 2 divisors, whose sum is σ = 1279389173940. Its totient is φ = 1279389173938.

The previous prime is 1279389173899. The next prime is 1279389173963. The reversal of 1279389173939 is 9393719839721.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1279389173939 is a prime.

It is not a weakly prime, because it can be changed into another prime (1279389173969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639694586969 + 639694586970.

It is an arithmetic number, because the mean of its divisors is an integer number (639694586970).

Almost surely, 2^{1279389173939} is an apocalyptic number.

1279389173939 is a deficient number, since it is larger than the sum of its proper divisors (1).

1279389173939 is an equidigital number, since it uses as much as digits as its factorization.

1279389173939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138883248, while the sum is 71.

The spelling of 1279389173939 in words is "one trillion, two hundred seventy-nine billion, three hundred eighty-nine million, one hundred seventy-three thousand, nine hundred thirty-nine".