1639911379 has 2 divisors, whose sum is σ = 1639911380. Its totient is φ = 1639911378.

The previous prime is 1639911349. The next prime is 1639911457. The reversal of 1639911379 is 9731199361.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1639911379 - 2²⁹ = 1103040467 is a prime.

It is not a weakly prime, because it can be changed into another prime (1639911349) 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, 819955689 + 819955690.

It is an arithmetic number, because the mean of its divisors is an integer number (819955690).

Almost surely, 2^1639911379 is an apocalyptic number.

1639911379 is a deficient number, since it is larger than the sum of its proper divisors (1).

1639911379 is an equidigital number, since it uses as much as digits as its factorization.

1639911379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 275562, while the sum is 49.

The square root of 1639911379 is about 40495.8192780440. The cubic root of 1639911379 is about 1179.2524660636.

The spelling of 1639911379 in words is "one billion, six hundred thirty-nine million, nine hundred eleven thousand, three hundred seventy-nine".