1378315391 has 4 divisors (see below), whose sum is σ = 1384034784. Its totient is φ = 1372596000.

The previous prime is 1378315363. The next prime is 1378315417. The reversal of 1378315391 is 1935138731.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1378315391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378315361) 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, 2859335 + ... + 2859816.

It is an arithmetic number, because the mean of its divisors is an integer number (346008696).

Almost surely, 2^1378315391 is an apocalyptic number.

1378315391 is a deficient number, since it is larger than the sum of its proper divisors (5719393).

1378315391 is an equidigital number, since it uses as much as digits as its factorization.

1378315391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5719392.

The product of its digits is 68040, while the sum is 41.

The square root of 1378315391 is about 37125.6702431081. The cubic root of 1378315391 is about 1112.8830689574.

The spelling of 1378315391 in words is "one billion, three hundred seventy-eight million, three hundred fifteen thousand, three hundred ninety-one".