1155401993 has 2 divisors, whose sum is σ = 1155401994. Its totient is φ = 1155401992.

The previous prime is 1155401981. The next prime is 1155402011. The reversal of 1155401993 is 3991045511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1142642809 + 12759184 = 33803^2 + 3572^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155401993 - 2¹² = 1155397897 is a prime.

It is not a weakly prime, because it can be changed into another prime (1155401903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577700996 + 577700997.

It is an arithmetic number, because the mean of its divisors is an integer number (577700997).

Almost surely, 2^1155401993 is an apocalyptic number.

It is an amenable number.

1155401993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155401993 is an equidigital number, since it uses as much as digits as its factorization.

1155401993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24300, while the sum is 38.

The square root of 1155401993 is about 33991.2046417893. The cubic root of 1155401993 is about 1049.3274583585.

The spelling of 1155401993 in words is "one billion, one hundred fifty-five million, four hundred one thousand, nine hundred ninety-three".