316821669 has 4 divisors (see below), whose sum is σ = 422428896. Its totient is φ = 211214444.

The previous prime is 316821649. The next prime is 316821671. The reversal of 316821669 is 966128613.

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, and also an emirpimes, since its reverse is a distinct semiprime: 966128613 = 3 ⋅322042871.

It is a cyclic number.

It is not a de Polignac number, because 316821669 - 2⁸ = 316821413 is a prime.

It is a super-2 number, since 2×316821669² = 200751939895891122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 316821669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (316821649) 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, 52803609 + ... + 52803614.

It is an arithmetic number, because the mean of its divisors is an integer number (105607224).

Almost surely, 2^316821669 is an apocalyptic number.

It is an amenable number.

316821669 is a deficient number, since it is larger than the sum of its proper divisors (105607227).

316821669 is a wasteful number, since it uses less digits than its factorization.

316821669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105607226.

The product of its digits is 93312, while the sum is 42.

The square root of 316821669 is about 17799.4850768217. The cubic root of 316821669 is about 681.7183107262.

The spelling of 316821669 in words is "three hundred sixteen million, eight hundred twenty-one thousand, six hundred sixty-nine".