316821131 has 8 divisors (see below), whose sum is σ = 348147504. Its totient is φ = 285915520.

The previous prime is 316821097. The next prime is 316821139. The reversal of 316821131 is 131128613.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 316821131 - 2¹⁰ = 316820107 is a prime.

It is a super-2 number, since 2×316821131² = 200751258096238322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 316821131.

It is not an unprimeable number, because it can be changed into a prime (316821139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103610 + ... + 106623.

It is an arithmetic number, because the mean of its divisors is an integer number (43518438).

Almost surely, 2^316821131 is an apocalyptic number.

316821131 is a deficient number, since it is larger than the sum of its proper divisors (31326373).

316821131 is a wasteful number, since it uses less digits than its factorization.

316821131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210381.

The product of its digits is 864, while the sum is 26.

The square root of 316821131 is about 17799.4699640186. The cubic root of 316821131 is about 681.7179248470.

Adding to 316821131 its reverse (131128613), we get a palindrome (447949744).

The spelling of 316821131 in words is "three hundred sixteen million, eight hundred twenty-one thousand, one hundred thirty-one".