1321312311 has 16 divisors (see below), whose sum is σ = 2135454720. Its totient is φ = 800795160.

The previous prime is 1321312309. The next prime is 1321312327. The reversal of 1321312311 is 1132131231.

1321312311 is a `hidden beast` number, since 1 + 321 + 31 + 2 + 311 = 666.

It is not a de Polignac number, because 1321312311 - 2¹ = 1321312309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321310311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2224135 + ... + 2224728.

It is an arithmetic number, because the mean of its divisors is an integer number (133465920).

Almost surely, 2^1321312311 is an apocalyptic number.

1321312311 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1321312311 is a deficient number, since it is larger than the sum of its proper divisors (814142409).

1321312311 is a wasteful number, since it uses less digits than its factorization.

1321312311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4448883 (or 4448877 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 1321312311 is about 36349.8598484231. The cubic root of 1321312311 is about 1097.3247139212.

Adding to 1321312311 its reverse (1132131231), we get a palindrome (2453443542).

The spelling of 1321312311 in words is "one billion, three hundred twenty-one million, three hundred twelve thousand, three hundred eleven".