1631963947 has 2 divisors, whose sum is σ = 1631963948. Its totient is φ = 1631963946.

The previous prime is 1631963933. The next prime is 1631963953. The reversal of 1631963947 is 7493691361.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1631963947 - 2⁷ = 1631963819 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1631963947.

It is not a weakly prime, because it can be changed into another prime (1631963147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815981973 + 815981974.

It is an arithmetic number, because the mean of its divisors is an integer number (815981974).

Almost surely, 2^1631963947 is an apocalyptic number.

1631963947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1631963947 is an equidigital number, since it uses as much as digits as its factorization.

1631963947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 49.

The square root of 1631963947 is about 40397.5735286168. The cubic root of 1631963947 is about 1177.3443935600.

The spelling of 1631963947 in words is "one billion, six hundred thirty-one million, nine hundred sixty-three thousand, nine hundred forty-seven".