1315020391 has 2 divisors, whose sum is σ = 1315020392. Its totient is φ = 1315020390.

The previous prime is 1315020389. The next prime is 1315020401. The reversal of 1315020391 is 1930205131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1315020391 - 2¹ = 1315020389 is a prime.

Together with 1315020389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1315027391) 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 as a sum of consecutive naturals, namely, 657510195 + 657510196.

It is an arithmetic number, because the mean of its divisors is an integer number (657510196).

Almost surely, 2^1315020391 is an apocalyptic number.

1315020391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1315020391 is an equidigital number, since it uses as much as digits as its factorization.

1315020391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 810, while the sum is 25.

The square root of 1315020391 is about 36263.2098827448. The cubic root of 1315020391 is about 1095.5801686337.

The spelling of 1315020391 in words is "one billion, three hundred fifteen million, twenty thousand, three hundred ninety-one".