1315441721 has 4 divisors (see below), whose sum is σ = 1435027344. Its totient is φ = 1195856100.

The previous prime is 1315441717. The next prime is 1315441741. The reversal of 1315441721 is 1271445131.

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 1315441721 - 2² = 1315441717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1315441741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59792795 + ... + 59792816.

It is an arithmetic number, because the mean of its divisors is an integer number (358756836).

Almost surely, 2^1315441721 is an apocalyptic number.

1315441721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1315441721 is a deficient number, since it is larger than the sum of its proper divisors (119585623).

1315441721 is a wasteful number, since it uses less digits than its factorization.

1315441721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119585622.

The product of its digits is 3360, while the sum is 29.

The square root of 1315441721 is about 36269.0187487889. The cubic root of 1315441721 is about 1095.6971633981.

Adding to 1315441721 its reverse (1271445131), we get a palindrome (2586886852).

The spelling of 1315441721 in words is "one billion, three hundred fifteen million, four hundred forty-one thousand, seven hundred twenty-one".