1311155011 has 8 divisors (see below), whose sum is σ = 1343485440. Its totient is φ = 1278908232.

The previous prime is 1311155003. The next prime is 1311155017. The reversal of 1311155011 is 1105511131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1311155011 - 2³ = 1311155003 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1311155011.

It is not an unprimeable number, because it can be changed into a prime (1311155017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11430 + ... + 52468.

It is an arithmetic number, because the mean of its divisors is an integer number (167935680).

Almost surely, 2^1311155011 is an apocalyptic number.

1311155011 is a deficient number, since it is larger than the sum of its proper divisors (32330429).

1311155011 is an equidigital number, since it uses as much as digits as its factorization.

1311155011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41825.

The product of its (nonzero) digits is 75, while the sum is 19.

The square root of 1311155011 is about 36209.8744957781. The cubic root of 1311155011 is about 1094.5056631760.

Adding to 1311155011 its reverse (1105511131), we get a palindrome (2416666142).

The spelling of 1311155011 in words is "one billion, three hundred eleven million, one hundred fifty-five thousand, eleven".