315211231 has 4 divisors (see below), whose sum is σ = 315261072. Its totient is φ = 315161392.

The previous prime is 315211223. The next prime is 315211243. The reversal of 315211231 is 132112513.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132112513 = 13 ⋅10162501.

It is a cyclic number.

It is not a de Polignac number, because 315211231 - 2³ = 315211223 is a prime.

It is a super-2 number, since 2×315211231² = 198716240297070722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 315211199 and 315211208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315211261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13771 + ... + 28636.

It is an arithmetic number, because the mean of its divisors is an integer number (78815268).

Almost surely, 2^315211231 is an apocalyptic number.

315211231 is a deficient number, since it is larger than the sum of its proper divisors (49841).

315211231 is an equidigital number, since it uses as much as digits as its factorization.

315211231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49840.

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

The square root of 315211231 is about 17754.1891113055. The cubic root of 315211231 is about 680.5612659915.

Adding to 315211231 its reverse (132112513), we get a palindrome (447323744).

The spelling of 315211231 in words is "three hundred fifteen million, two hundred eleven thousand, two hundred thirty-one".