1311213201 has 4 divisors (see below), whose sum is σ = 1748284272. Its totient is φ = 874142132.

The previous prime is 1311213193. The next prime is 1311213217. The reversal of 1311213201 is 1023121131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1311213201 - 2³ = 1311213193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1311213301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218535531 + ... + 218535536.

It is an arithmetic number, because the mean of its divisors is an integer number (437071068).

Almost surely, 2^1311213201 is an apocalyptic number.

It is an amenable number.

1311213201 is a deficient number, since it is larger than the sum of its proper divisors (437071071).

1311213201 is an equidigital number, since it uses as much as digits as its factorization.

1311213201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437071070.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1311213201 is about 36210.6779969666. The cubic root of 1311213201 is about 1094.5218545854.

Adding to 1311213201 its reverse (1023121131), we get a palindrome (2334334332).

The spelling of 1311213201 in words is "one billion, three hundred eleven million, two hundred thirteen thousand, two hundred one".