1491608893 has 2 divisors, whose sum is σ = 1491608894. Its totient is φ = 1491608892.

The previous prime is 1491608891. The next prime is 1491608929. The reversal of 1491608893 is 3988061941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 911858809 + 579750084 = 30197^2 + 24078^2 .

It is an emirp because it is prime and its reverse (3988061941) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1491608893 - 2¹ = 1491608891 is a prime.

Together with 1491608891, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1491608891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745804446 + 745804447.

It is an arithmetic number, because the mean of its divisors is an integer number (745804447).

Almost surely, 2^1491608893 is an apocalyptic number.

It is an amenable number.

1491608893 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491608893 is an equidigital number, since it uses as much as digits as its factorization.

1491608893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 49.

The square root of 1491608893 is about 38621.3528116248. The cubic root of 1491608893 is about 1142.5757121753.

The spelling of 1491608893 in words is "one billion, four hundred ninety-one million, six hundred eight thousand, eight hundred ninety-three".