1338876991 has 2 divisors, whose sum is σ = 1338876992. Its totient is φ = 1338876990.

The previous prime is 1338876977. The next prime is 1338877063. The reversal of 1338876991 is 1996788331.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1338876991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1338876941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669438495 + 669438496.

It is an arithmetic number, because the mean of its divisors is an integer number (669438496).

Almost surely, 2^1338876991 is an apocalyptic number.

1338876991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1338876991 is an equidigital number, since it uses as much as digits as its factorization.

1338876991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1959552, while the sum is 55.

The square root of 1338876991 is about 36590.6680862758. The cubic root of 1338876991 is about 1102.1657032917.

The spelling of 1338876991 in words is "one billion, three hundred thirty-eight million, eight hundred seventy-six thousand, nine hundred ninety-one".