1211312311 has 8 divisors (see below), whose sum is σ = 1325116800. Its totient is φ = 1098122040.

The previous prime is 1211312251. The next prime is 1211312317. The reversal of 1211312311 is 1132131121.

It is a happy number.

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 1211312311 - 2²³ = 1202923703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211312317) 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, 149421 + ... + 157318.

It is an arithmetic number, because the mean of its divisors is an integer number (165639600).

Almost surely, 2^1211312311 is an apocalyptic number.

1211312311 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1211312311 is a deficient number, since it is larger than the sum of its proper divisors (113804489).

1211312311 is a wasteful number, since it uses less digits than its factorization.

1211312311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307109.

The product of its digits is 36, while the sum is 16.

The square root of 1211312311 is about 34803.9122944533. The cubic root of 1211312311 is about 1065.9873321643.

Adding to 1211312311 its reverse (1132131121), we get a palindrome (2343443432).

The spelling of 1211312311 in words is "one billion, two hundred eleven million, three hundred twelve thousand, three hundred eleven".