1155403211 has 2 divisors, whose sum is σ = 1155403212. Its totient is φ = 1155403210.

The previous prime is 1155403189. The next prime is 1155403213. The reversal of 1155403211 is 1123045511.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1155403211 - 2¹⁰ = 1155402187 is a prime.

It is a super-2 number, since 2×1155403211² = 2669913159978221042, which contains 22 as substring.

Together with 1155403213, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1155403213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577701605 + 577701606.

It is an arithmetic number, because the mean of its divisors is an integer number (577701606).

Almost surely, 2^1155403211 is an apocalyptic number.

1155403211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155403211 is an equidigital number, since it uses as much as digits as its factorization.

1155403211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 1155403211 is about 33991.2225581840. Note that the first 3 decimals coincide. The cubic root of 1155403211 is about 1049.3278270845.

Adding to 1155403211 its reverse (1123045511), we get a palindrome (2278448722).

The spelling of 1155403211 in words is "one billion, one hundred fifty-five million, four hundred three thousand, two hundred eleven".