1491856963 has 2 divisors, whose sum is σ = 1491856964. Its totient is φ = 1491856962.

The previous prime is 1491856813. The next prime is 1491856967. The reversal of 1491856963 is 3696581941.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1491856963 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1491856963.

It is not a weakly prime, because it can be changed into another prime (1491856967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745928481 + 745928482.

It is an arithmetic number, because the mean of its divisors is an integer number (745928482).

Almost surely, 2^1491856963 is an apocalyptic number.

1491856963 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491856963 is an equidigital number, since it uses as much as digits as its factorization.

1491856963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1399680, while the sum is 52.

The square root of 1491856963 is about 38624.5642434967. The cubic root of 1491856963 is about 1142.6390493872.

The spelling of 1491856963 in words is "one billion, four hundred ninety-one million, eight hundred fifty-six thousand, nine hundred sixty-three".