1312203211 has 16 divisors (see below), whose sum is σ = 1459830528. Its totient is φ = 1169532000.

The previous prime is 1312203209. The next prime is 1312203239. The reversal of 1312203211 is 1123022131.

It is a cyclic number.

It is not a de Polignac number, because 1312203211 - 2¹ = 1312203209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1312203271) 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, 108700 + ... + 120166.

It is an arithmetic number, because the mean of its divisors is an integer number (91239408).

Almost surely, 2^1312203211 is an apocalyptic number.

1312203211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1312203211 is a deficient number, since it is larger than the sum of its proper divisors (147627317).

1312203211 is a wasteful number, since it uses less digits than its factorization.

1312203211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11682.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1312203211 is about 36224.3455565453. The cubic root of 1312203211 is about 1094.7972522043.

Adding to 1312203211 its reverse (1123022131), we get a palindrome (2435225342).

It can be divided in two parts, 131220 and 3211, that added together give a palindrome (134431).

The spelling of 1312203211 in words is "one billion, three hundred twelve million, two hundred three thousand, two hundred eleven".