1649997163 has 2 divisors, whose sum is σ = 1649997164. Its totient is φ = 1649997162.

The previous prime is 1649997143. The next prime is 1649997179. The reversal of 1649997163 is 3617999461.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1649997163 - 2⁵ = 1649997131 is a prime.

It is not a weakly prime, because it can be changed into another prime (1649997143) 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, 824998581 + 824998582.

It is an arithmetic number, because the mean of its divisors is an integer number (824998582).

Almost surely, 2^1649997163 is an apocalyptic number.

1649997163 is a deficient number, since it is larger than the sum of its proper divisors (1).

1649997163 is an equidigital number, since it uses as much as digits as its factorization.

1649997163 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2204496, while the sum is 55.

The square root of 1649997163 is about 40620.1571021088. The cubic root of 1649997163 is about 1181.6650732175.

The spelling of 1649997163 in words is "one billion, six hundred forty-nine million, nine hundred ninety-seven thousand, one hundred sixty-three".