1649136173 has 2 divisors, whose sum is σ = 1649136174. Its totient is φ = 1649136172.

The previous prime is 1649136169. The next prime is 1649136197. The reversal of 1649136173 is 3716319461.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1601760484 + 47375689 = 40022^2 + 6883^2 .

It is a cyclic number.

It is not a de Polignac number, because 1649136173 - 2² = 1649136169 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1649136173.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1649136113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824568086 + 824568087.

It is an arithmetic number, because the mean of its divisors is an integer number (824568087).

Almost surely, 2^1649136173 is an apocalyptic number.

It is an amenable number.

1649136173 is a deficient number, since it is larger than the sum of its proper divisors (1).

1649136173 is an equidigital number, since it uses as much as digits as its factorization.

1649136173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 41.

The square root of 1649136173 is about 40609.5576558031. The cubic root of 1649136173 is about 1181.4595013838.

The spelling of 1649136173 in words is "one billion, six hundred forty-nine million, one hundred thirty-six thousand, one hundred seventy-three".