315873391 has 4 divisors (see below), whose sum is σ = 320322384. Its totient is φ = 311424400.

The previous prime is 315873367. The next prime is 315873407. The reversal of 315873391 is 193378513.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193378513 = 389 ⋅497117.

It is a cyclic number.

It is not a de Polignac number, because 315873391 - 2¹⁷ = 315742319 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315873331) 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, 2224390 + ... + 2224531.

It is an arithmetic number, because the mean of its divisors is an integer number (80080596).

Almost surely, 2^315873391 is an apocalyptic number.

315873391 is a deficient number, since it is larger than the sum of its proper divisors (4448993).

315873391 is an equidigital number, since it uses as much as digits as its factorization.

315873391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4448992.

The product of its digits is 68040, while the sum is 40.

The square root of 315873391 is about 17772.8273215040. The cubic root of 315873391 is about 681.0374813247.

The spelling of 315873391 in words is "three hundred fifteen million, eight hundred seventy-three thousand, three hundred ninety-one".