1491839497 has 2 divisors, whose sum is σ = 1491839498. Its totient is φ = 1491839496.

The previous prime is 1491839491. The next prime is 1491839513. The reversal of 1491839497 is 7949381941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1238265721 + 253573776 = 35189^2 + 15924^2 .

It is an emirp because it is prime and its reverse (7949381941) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1491839497 - 2¹¹ = 1491837449 is a prime.

It is not a weakly prime, because it can be changed into another prime (1491839491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745919748 + 745919749.

It is an arithmetic number, because the mean of its divisors is an integer number (745919749).

Almost surely, 2^1491839497 is an apocalyptic number.

It is an amenable number.

1491839497 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491839497 is an equidigital number, since it uses as much as digits as its factorization.

1491839497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1959552, while the sum is 55.

The square root of 1491839497 is about 38624.3381431967. The cubic root of 1491839497 is about 1142.6345901993.

The spelling of 1491839497 in words is "one billion, four hundred ninety-one million, eight hundred thirty-nine thousand, four hundred ninety-seven".