1311012011 has 4 divisors (see below), whose sum is σ = 1311193272. Its totient is φ = 1310830752.

The previous prime is 1311012007. The next prime is 1311012071. The reversal of 1311012011 is 1102101131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1102101131 = 16231 ⋅67901.

It is a cyclic number.

It is not a de Polignac number, because 1311012011 - 2² = 1311012007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1311011983 and 1311012001.

It is not an unprimeable number, because it can be changed into a prime (1311012071) 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, 79310 + ... + 94403.

It is an arithmetic number, because the mean of its divisors is an integer number (327798318).

Almost surely, 2^1311012011 is an apocalyptic number.

1311012011 is a deficient number, since it is larger than the sum of its proper divisors (181261).

1311012011 is an equidigital number, since it uses as much as digits as its factorization.

1311012011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181260.

The product of its (nonzero) digits is 6, while the sum is 11.

The square root of 1311012011 is about 36207.8998424377. The cubic root of 1311012011 is about 1094.4658712880.

Adding to 1311012011 its reverse (1102101131), we get a palindrome (2413113142).

The spelling of 1311012011 in words is "one billion, three hundred eleven million, twelve thousand, eleven".