311231225 has 6 divisors (see below), whose sum is σ = 385926750. Its totient is φ = 248984960.

The previous prime is 311231209. The next prime is 311231233. The reversal of 311231225 is 522132113.

It can be written as a sum of positive squares in 3 ways, for example, as 41319184 + 269912041 = 6428^2 + 16429^2 .

It is not a de Polignac number, because 311231225 - 2⁴ = 311231209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 311231197 and 311231206.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6224600 + ... + 6224649.

It is an arithmetic number, because the mean of its divisors is an integer number (64321125).

Almost surely, 2^311231225 is an apocalyptic number.

It is an amenable number.

311231225 is a deficient number, since it is larger than the sum of its proper divisors (74695525).

311231225 is a wasteful number, since it uses less digits than its factorization.

311231225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12449259 (or 12449254 counting only the distinct ones).

The product of its digits is 360, while the sum is 20.

The square root of 311231225 is about 17641.7466538889. The cubic root of 311231225 is about 677.6847623607.

Adding to 311231225 its reverse (522132113), we get a palindrome (833363338).

The spelling of 311231225 in words is "three hundred eleven million, two hundred thirty-one thousand, two hundred twenty-five".