1304205649 has 2 divisors, whose sum is σ = 1304205650. Its totient is φ = 1304205648.

The previous prime is 1304205647. The next prime is 1304205701. The reversal of 1304205649 is 9465024031.

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., 1157020225 + 147185424 = 34015^2 + 12132^2 .

It is a cyclic number.

It is not a de Polignac number, because 1304205649 - 2¹ = 1304205647 is a prime.

It is a super-2 number, since 2×1304205649² = 3401904749767022402, which contains 22 as substring.

Together with 1304205647, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1304205647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 652102824 + 652102825.

It is an arithmetic number, because the mean of its divisors is an integer number (652102825).

Almost surely, 2^1304205649 is an apocalyptic number.

It is an amenable number.

1304205649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1304205649 is an equidigital number, since it uses as much as digits as its factorization.

1304205649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 1304205649 is about 36113.7875194502. The cubic root of 1304205649 is about 1092.5685431950.

The spelling of 1304205649 in words is "one billion, three hundred four million, two hundred five thousand, six hundred forty-nine".