1313221361 has 4 divisors (see below), whose sum is σ = 1313473392. Its totient is φ = 1312969332.

The previous prime is 1313221337. The next prime is 1313221369. The reversal of 1313221361 is 1631223131.

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 1313221361 - 2¹⁸ = 1312959217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1313221369) 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, 118031 + ... + 128676.

It is an arithmetic number, because the mean of its divisors is an integer number (328368348).

Almost surely, 2^1313221361 is an apocalyptic number.

It is an amenable number.

1313221361 is a deficient number, since it is larger than the sum of its proper divisors (252031).

1313221361 is an equidigital number, since it uses as much as digits as its factorization.

1313221361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252030.

The product of its digits is 648, while the sum is 23.

The square root of 1313221361 is about 36238.3962255506. The cubic root of 1313221361 is about 1095.0803332708.

Adding to 1313221361 its reverse (1631223131), we get a palindrome (2944444492).

The spelling of 1313221361 in words is "one billion, three hundred thirteen million, two hundred twenty-one thousand, three hundred sixty-one".