1144664021 has 2 divisors, whose sum is σ = 1144664022. Its totient is φ = 1144664020.

The previous prime is 1144663981. The next prime is 1144664033. The reversal of 1144664021 is 1204664411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1005777796 + 138886225 = 31714^2 + 11785^2 .

It is a cyclic number.

It is not a de Polignac number, because 1144664021 - 2⁶ = 1144663957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1144664051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 572332010 + 572332011.

It is an arithmetic number, because the mean of its divisors is an integer number (572332011).

Almost surely, 2^1144664021 is an apocalyptic number.

It is an amenable number.

1144664021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1144664021 is an equidigital number, since it uses as much as digits as its factorization.

1144664021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 1144664021 is about 33832.8837227925. The cubic root of 1144664021 is about 1046.0666203195.

The spelling of 1144664021 in words is "one billion, one hundred forty-four million, six hundred sixty-four thousand, twenty-one".