1155321403 has 2 divisors, whose sum is σ = 1155321404. Its totient is φ = 1155321402.

The previous prime is 1155321383. The next prime is 1155321437. The reversal of 1155321403 is 3041235511.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1155321403 - 2⁹ = 1155320891 is a prime.

It is not a weakly prime, because it can be changed into another prime (1155321473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577660701 + 577660702.

It is an arithmetic number, because the mean of its divisors is an integer number (577660702).

Almost surely, 2^1155321403 is an apocalyptic number.

1155321403 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155321403 is an equidigital number, since it uses as much as digits as its factorization.

1155321403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 1155321403 is about 33990.0191673968. The cubic root of 1155321403 is about 1049.3030607125.

Adding to 1155321403 its reverse (3041235511), we get a palindrome (4196556914).

The spelling of 1155321403 in words is "one billion, one hundred fifty-five million, three hundred twenty-one thousand, four hundred three".