1143004721 has 2 divisors, whose sum is σ = 1143004722. Its totient is φ = 1143004720.

The previous prime is 1143004691. The next prime is 1143004729. The reversal of 1143004721 is 1274003411.

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., 670551025 + 472453696 = 25895^2 + 21736^2 .

It is an emirp because it is prime and its reverse (1274003411) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1143004721 - 2¹⁸ = 1142742577 is a prime.

It is not a weakly prime, because it can be changed into another prime (1143004729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 571502360 + 571502361.

It is an arithmetic number, because the mean of its divisors is an integer number (571502361).

Almost surely, 2^1143004721 is an apocalyptic number.

It is an amenable number.

1143004721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1143004721 is an equidigital number, since it uses as much as digits as its factorization.

1143004721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 1143004721 is about 33808.3528288499. The cubic root of 1143004721 is about 1045.5609180075.

The spelling of 1143004721 in words is "one billion, one hundred forty-three million, four thousand, seven hundred twenty-one".