315213211 has 4 divisors (see below), whose sum is σ = 331803400. Its totient is φ = 298623024.

The previous prime is 315213193. The next prime is 315213247. The reversal of 315213211 is 112312513.

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 315213211 - 2⁹ = 315212699 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 16590169 = 315213211 / (3 + 1 + 5 + 2 + 1 + 3 + 2 + 1 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (315213251) 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, 8295066 + ... + 8295103.

It is an arithmetic number, because the mean of its divisors is an integer number (82950850).

Almost surely, 2^315213211 is an apocalyptic number.

315213211 is a deficient number, since it is larger than the sum of its proper divisors (16590189).

315213211 is a wasteful number, since it uses less digits than its factorization.

315213211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16590188.

The product of its digits is 180, while the sum is 19.

The square root of 315213211 is about 17754.2448727058. The cubic root of 315213211 is about 680.5626909708.

Adding to 315213211 its reverse (112312513), we get a palindrome (427525724).

The spelling of 315213211 in words is "three hundred fifteen million, two hundred thirteen thousand, two hundred eleven".