1315870321 has 4 divisors (see below), whose sum is σ = 1323749952. Its totient is φ = 1307990692.

The previous prime is 1315870313. The next prime is 1315870337. The reversal of 1315870321 is 1230785131.

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 1315870321 - 2³ = 1315870313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1315870301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3939565 + ... + 3939898.

It is an arithmetic number, because the mean of its divisors is an integer number (330937488).

Almost surely, 2^1315870321 is an apocalyptic number.

It is an amenable number.

1315870321 is a deficient number, since it is larger than the sum of its proper divisors (7879631).

1315870321 is an equidigital number, since it uses as much as digits as its factorization.

1315870321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7879630.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 1315870321 is about 36274.9268917251. The cubic root of 1315870321 is about 1095.8161512641.

The spelling of 1315870321 in words is "one billion, three hundred fifteen million, eight hundred seventy thousand, three hundred twenty-one".