1311020211 has 8 divisors (see below), whose sum is σ = 1748194560. Its totient is φ = 873929672.

The previous prime is 1311020201. The next prime is 1311020233. The reversal of 1311020211 is 1120201131.

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 1311020211 - 2⁶ = 1311020147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1311020201) 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, 47506 + ... + 69848.

It is an arithmetic number, because the mean of its divisors is an integer number (218524320).

Almost surely, 2^1311020211 is an apocalyptic number.

1311020211 is a deficient number, since it is larger than the sum of its proper divisors (437174349).

1311020211 is a wasteful number, since it uses less digits than its factorization.

1311020211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41905.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 1311020211 is about 36208.0130772181. The cubic root of 1311020211 is about 1094.4681531388.

Adding to 1311020211 its reverse (1120201131), we get a palindrome (2431221342).

The spelling of 1311020211 in words is "one billion, three hundred eleven million, twenty thousand, two hundred eleven".