316387891 has 4 divisors (see below), whose sum is σ = 326593984. Its totient is φ = 306181800.

The previous prime is 316387889. The next prime is 316387921. The reversal of 316387891 is 198783613.

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

It is a cyclic number.

It is not a de Polignac number, because 316387891 - 2¹ = 316387889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (316387801) 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, 5103000 + ... + 5103061.

It is an arithmetic number, because the mean of its divisors is an integer number (81648496).

Almost surely, 2^316387891 is an apocalyptic number.

316387891 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

316387891 is the 10270-th hex number.

316387891 is a deficient number, since it is larger than the sum of its proper divisors (10206093).

316387891 is a wasteful number, since it uses less digits than its factorization.

316387891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10206092.

The product of its digits is 217728, while the sum is 46.

The square root of 316387891 is about 17787.2957753561. The cubic root of 316387891 is about 681.4070425936.

The spelling of 316387891 in words is "three hundred sixteen million, three hundred eighty-seven thousand, eight hundred ninety-one".