1312211231 has 8 divisors (see below), whose sum is σ = 1388995200. Its totient is φ = 1236199320.

The previous prime is 1312211213. The next prime is 1312211239. The reversal of 1312211231 is 1321122131.

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 1312211231 - 2⁶ = 1312211167 is a prime.

It is a super-2 number, since 2×1312211231² = 3443796629525070722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312211239) 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, 189515 + ... + 196316.

It is an arithmetic number, because the mean of its divisors is an integer number (173624400).

Almost surely, 2^1312211231 is an apocalyptic number.

1312211231 is a deficient number, since it is larger than the sum of its proper divisors (76783969).

1312211231 is a wasteful number, since it uses less digits than its factorization.

1312211231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386029.

The product of its digits is 72, while the sum is 17.

The square root of 1312211231 is about 36224.4562554084. The cubic root of 1312211231 is about 1094.7994826150.

Adding to 1312211231 its reverse (1321122131), we get a palindrome (2633333362).

The spelling of 1312211231 in words is "one billion, three hundred twelve million, two hundred eleven thousand, two hundred thirty-one".