1491834139 has 2 divisors, whose sum is σ = 1491834140. Its totient is φ = 1491834138.

The previous prime is 1491834137. The next prime is 1491834161. The reversal of 1491834139 is 9314381941.

It is a weak prime.

It is an emirp because it is prime and its reverse (9314381941) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1491834139 - 2¹ = 1491834137 is a prime.

Together with 1491834137, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1491834095 and 1491834104.

It is not a weakly prime, because it can be changed into another prime (1491834137) 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, 745917069 + 745917070.

It is an arithmetic number, because the mean of its divisors is an integer number (745917070).

Almost surely, 2^1491834139 is an apocalyptic number.

1491834139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491834139 is an equidigital number, since it uses as much as digits as its factorization.

1491834139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 43.

The square root of 1491834139 is about 38624.2687827226. The cubic root of 1491834139 is about 1142.6332222587.

The spelling of 1491834139 in words is "one billion, four hundred ninety-one million, eight hundred thirty-four thousand, one hundred thirty-nine".