1155303331331 has 4 divisors (see below), whose sum is σ = 1161352040064. Its totient is φ = 1149254622600.

The previous prime is 1155303331261. The next prime is 1155303331333. The reversal of 1155303331331 is 1331333035511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1155303331331 is a prime.

It is a super-2 number, since 2×1155303331331² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1155303331333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3024354080 + ... + 3024354461.

It is an arithmetic number, because the mean of its divisors is an integer number (290338010016).

Almost surely, 2^{1155303331331} is an apocalyptic number.

1155303331331 is a deficient number, since it is larger than the sum of its proper divisors (6048708733).

1155303331331 is an equidigital number, since it uses as much as digits as its factorization.

1155303331331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6048708732.

The product of its (nonzero) digits is 18225, while the sum is 32.

Adding to 1155303331331 its reverse (1331333035511), we get a palindrome (2486636366842).

The spelling of 1155303331331 in words is "one trillion, one hundred fifty-five billion, three hundred three million, three hundred thirty-one thousand, three hundred thirty-one".