1313331421 has 4 divisors (see below), whose sum is σ = 1313875872. Its totient is φ = 1312786972.

The previous prime is 1313331419. The next prime is 1313331431. The reversal of 1313331421 is 1241333131.

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 1313331421 - 2¹ = 1313331419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1313331392 and 1313331401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313331431) 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, 268591 + ... + 273436.

It is an arithmetic number, because the mean of its divisors is an integer number (328468968).

Almost surely, 2^1313331421 is an apocalyptic number.

It is an amenable number.

1313331421 is a deficient number, since it is larger than the sum of its proper divisors (544451).

1313331421 is an equidigital number, since it uses as much as digits as its factorization.

1313331421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544450.

The product of its digits is 648, while the sum is 22.

The square root of 1313331421 is about 36239.9147487960. The cubic root of 1313331421 is about 1095.1109250096.

Adding to 1313331421 its reverse (1241333131), we get a palindrome (2554664552).

The spelling of 1313331421 in words is "one billion, three hundred thirteen million, three hundred thirty-one thousand, four hundred twenty-one".