315121213 has 16 divisors (see below), whose sum is σ = 363363840. Its totient is φ = 270270000.

The previous prime is 315121171. The next prime is 315121223. The reversal of 315121213 is 312121513.

It is not a de Polignac number, because 315121213 - 2¹³ = 315113021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315121223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49456 + ... + 55462.

It is an arithmetic number, because the mean of its divisors is an integer number (22710240).

Almost surely, 2^315121213 is an apocalyptic number.

It is an amenable number.

315121213 is a deficient number, since it is larger than the sum of its proper divisors (48242627).

315121213 is a wasteful number, since it uses less digits than its factorization.

315121213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6288.

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

The square root of 315121213 is about 17751.6538102792. The cubic root of 315121213 is about 680.4964749448.

Adding to 315121213 its reverse (312121513), we get a palindrome (627242726).

The spelling of 315121213 in words is "three hundred fifteen million, one hundred twenty-one thousand, two hundred thirteen".