1948649009 has 2 divisors, whose sum is σ = 1948649010. Its totient is φ = 1948649008.

The previous prime is 1948648979. The next prime is 1948649023. The reversal of 1948649009 is 9009468491.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1784809009 + 163840000 = 42247^2 + 12800^2 .

It is a cyclic number.

It is not a de Polignac number, because 1948649009 - 2⁸ = 1948648753 is a prime.

It is not a weakly prime, because it can be changed into another prime (1948649029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 974324504 + 974324505.

It is an arithmetic number, because the mean of its divisors is an integer number (974324505).

Almost surely, 2^1948649009 is an apocalyptic number.

It is an amenable number.

1948649009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1948649009 is an equidigital number, since it uses as much as digits as its factorization.

1948649009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 559872, while the sum is 50.

The square root of 1948649009 is about 44143.5047204003. The cubic root of 1948649009 is about 1249.0443915562.

The spelling of 1948649009 in words is "one billion, nine hundred forty-eight million, six hundred forty-nine thousand, nine".