1155143993 has 2 divisors, whose sum is σ = 1155143994. Its totient is φ = 1155143992.

The previous prime is 1155143989. The next prime is 1155144031. The reversal of 1155143993 is 3993415511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 828691369 + 326452624 = 28787^2 + 18068^2 .

It is an emirp because it is prime and its reverse (3993415511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1155143993 - 2² = 1155143989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1155143993.

It is not a weakly prime, because it can be changed into another prime (1155143923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577571996 + 577571997.

It is an arithmetic number, because the mean of its divisors is an integer number (577571997).

Almost surely, 2^1155143993 is an apocalyptic number.

It is an amenable number.

1155143993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155143993 is an equidigital number, since it uses as much as digits as its factorization.

1155143993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72900, while the sum is 41.

The square root of 1155143993 is about 33987.4093305153. The cubic root of 1155143993 is about 1049.2493479867.

The spelling of 1155143993 in words is "one billion, one hundred fifty-five million, one hundred forty-three thousand, nine hundred ninety-three".