316520243 has 4 divisors (see below), whose sum is σ = 340867968. Its totient is φ = 292172520.

The previous prime is 316520233. The next prime is 316520249. The reversal of 316520243 is 342025613.

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 316520243 - 2¹⁰ = 316519219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (316520249) 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, 12173843 + ... + 12173868.

It is an arithmetic number, because the mean of its divisors is an integer number (85216992).

Almost surely, 2^316520243 is an apocalyptic number.

316520243 is a deficient number, since it is larger than the sum of its proper divisors (24347725).

316520243 is a wasteful number, since it uses less digits than its factorization.

316520243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24347724.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 316520243 is about 17791.0157944958. The cubic root of 316520243 is about 681.5020451889.

Adding to 316520243 its reverse (342025613), we get a palindrome (658545856).

The spelling of 316520243 in words is "three hundred sixteen million, five hundred twenty thousand, two hundred forty-three".