311521225 has 12 divisors (see below), whose sum is σ = 389708316. Its totient is φ = 247009280.

The previous prime is 311521193. The next prime is 311521229. The reversal of 311521225 is 522125113.

It can be written as a sum of positive squares in 6 ways, for example, as 2886601 + 308634624 = 1699^2 + 17568^2 .

It is not a de Polignac number, because 311521225 - 2⁵ = 311521193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311521196 and 311521205.

It is not an unprimeable number, because it can be changed into a prime (311521229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52312 + ... + 57961.

It is an arithmetic number, because the mean of its divisors is an integer number (32475693).

Almost surely, 2^311521225 is an apocalyptic number.

It is an amenable number.

311521225 is a deficient number, since it is larger than the sum of its proper divisors (78187091).

311521225 is a wasteful number, since it uses less digits than its factorization.

311521225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110396 (or 110391 counting only the distinct ones).

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

The square root of 311521225 is about 17649.9638809829. The cubic root of 311521225 is about 677.8951820918.

Adding to 311521225 its reverse (522125113), we get a palindrome (833646338).

The spelling of 311521225 in words is "three hundred eleven million, five hundred twenty-one thousand, two hundred twenty-five".