1491360643 has 2 divisors, whose sum is σ = 1491360644. Its totient is φ = 1491360642.

The previous prime is 1491360631. The next prime is 1491360659. The reversal of 1491360643 is 3460631941.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1491360643 is a prime.

It is not a weakly prime, because it can be changed into another prime (1491360623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745680321 + 745680322.

It is an arithmetic number, because the mean of its divisors is an integer number (745680322).

Almost surely, 2^1491360643 is an apocalyptic number.

1491360643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491360643 is an equidigital number, since it uses as much as digits as its factorization.

1491360643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 1491360643 is about 38618.1387821837. The cubic root of 1491360643 is about 1142.5123219754.

The spelling of 1491360643 in words is "one billion, four hundred ninety-one million, three hundred sixty thousand, six hundred forty-three".