315125221 has 8 divisors (see below), whose sum is σ = 323316504. Its totient is φ = 306958080.

The previous prime is 315125201. The next prime is 315125269. The reversal of 315125221 is 122521513.

It can be written as a sum of positive squares in 4 ways, for example, as 36602500 + 278522721 = 6050^2 + 16689^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 315125221 - 2¹⁷ = 314994149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 315125192 and 315125201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315125201) 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, 22081 + ... + 33433.

It is an arithmetic number, because the mean of its divisors is an integer number (40414563).

Almost surely, 2^315125221 is an apocalyptic number.

It is an amenable number.

315125221 is a deficient number, since it is larger than the sum of its proper divisors (8191283).

315125221 is a wasteful number, since it uses less digits than its factorization.

315125221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12071.

The product of its digits is 600, while the sum is 22.

The square root of 315125221 is about 17751.7667008104. The cubic root of 315125221 is about 680.4993599915.

Adding to 315125221 its reverse (122521513), we get a palindrome (437646734).

The spelling of 315125221 in words is "three hundred fifteen million, one hundred twenty-five thousand, two hundred twenty-one".