1639113479 has 2 divisors, whose sum is σ = 1639113480. Its totient is φ = 1639113478.

The previous prime is 1639113473. The next prime is 1639113521. The reversal of 1639113479 is 9743119361.

It is a weak prime.

It is an emirp because it is prime and its reverse (9743119361) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1639113479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1639113473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 819556739 + 819556740.

It is an arithmetic number, because the mean of its divisors is an integer number (819556740).

Almost surely, 2^1639113479 is an apocalyptic number.

1639113479 is a deficient number, since it is larger than the sum of its proper divisors (1).

1639113479 is an equidigital number, since it uses as much as digits as its factorization.

1639113479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 44.

The square root of 1639113479 is about 40485.9664451770. The cubic root of 1639113479 is about 1179.0611796729.

The spelling of 1639113479 in words is "one billion, six hundred thirty-nine million, one hundred thirteen thousand, four hundred seventy-nine".