1491663179 has 2 divisors, whose sum is σ = 1491663180. Its totient is φ = 1491663178.

The previous prime is 1491663119. The next prime is 1491663221. The reversal of 1491663179 is 9713661941.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1491663179 is a prime.

It is not a weakly prime, because it can be changed into another prime (1491663119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745831589 + 745831590.

It is an arithmetic number, because the mean of its divisors is an integer number (745831590).

Almost surely, 2^1491663179 is an apocalyptic number.

1491663179 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491663179 is an equidigital number, since it uses as much as digits as its factorization.

1491663179 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 47.

The square root of 1491663179 is about 38622.0556029842. The cubic root of 1491663179 is about 1142.5895730726.

The spelling of 1491663179 in words is "one billion, four hundred ninety-one million, six hundred sixty-three thousand, one hundred seventy-nine".