1864648321 has 2 divisors, whose sum is σ = 1864648322. Its totient is φ = 1864648320.

The previous prime is 1864648283. The next prime is 1864648333. The reversal of 1864648321 is 1238464681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1536640000 + 328008321 = 39200^2 + 18111^2 .

It is an emirp because it is prime and its reverse (1238464681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1864648321 - 2⁷ = 1864648193 is a prime.

It is a super-2 number, since 2×1864648321² = 6953826722016238082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1864648381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 932324160 + 932324161.

It is an arithmetic number, because the mean of its divisors is an integer number (932324161).

Almost surely, 2^1864648321 is an apocalyptic number.

It is an amenable number.

1864648321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1864648321 is an equidigital number, since it uses as much as digits as its factorization.

1864648321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 221184, while the sum is 43.

The square root of 1864648321 is about 43181.5738596916. The cubic root of 1864648321 is about 1230.8325649737.

The spelling of 1864648321 in words is "one billion, eight hundred sixty-four million, six hundred forty-eight thousand, three hundred twenty-one".