315040221 has 6 divisors (see below), whose sum is σ = 455058110. Its totient is φ = 210026808.

The previous prime is 315040199. The next prime is 315040241. The reversal of 315040221 is 122040513.

It can be written as a sum of positive squares in only one way, i.e., 167417721 + 147622500 = 12939^2 + 12150^2 .

It is not a de Polignac number, because 315040221 - 2²¹ = 312943069 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 315040194 and 315040203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315040241) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17502226 + ... + 17502243.

Almost surely, 2^315040221 is an apocalyptic number.

It is an amenable number.

315040221 is a deficient number, since it is larger than the sum of its proper divisors (140017889).

315040221 is a wasteful number, since it uses less digits than its factorization.

315040221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35004475 (or 35004472 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 315040221 is about 17749.3724114404. The cubic root of 315040221 is about 680.4381698749.

Adding to 315040221 its reverse (122040513), we get a palindrome (437080734).

The spelling of 315040221 in words is "three hundred fifteen million, forty thousand, two hundred twenty-one".