1601948009 has 2 divisors, whose sum is σ = 1601948010. Its totient is φ = 1601948008.

The previous prime is 1601947939. The next prime is 1601948011. The reversal of 1601948009 is 9008491061.

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., 1595203600 + 6744409 = 39940^2 + 2597^2 .

It is a cyclic number.

It is not a de Polignac number, because 1601948009 - 2¹² = 1601943913 is a prime.

It is a Sophie Germain prime.

Together with 1601948011, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1601948059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800974004 + 800974005.

It is an arithmetic number, because the mean of its divisors is an integer number (800974005).

Almost surely, 2^1601948009 is an apocalyptic number.

It is an amenable number.

1601948009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601948009 is an equidigital number, since it uses as much as digits as its factorization.

1601948009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 1601948009 is about 40024.3427054087. The cubic root of 1601948009 is about 1170.0815705176.

The spelling of 1601948009 in words is "one billion, six hundred one million, nine hundred forty-eight thousand, nine".