306172225 has 12 divisors (see below), whose sum is σ = 389915644. Its totient is φ = 238317120.

The previous prime is 306172219. The next prime is 306172259. The reversal of 306172225 is 522271603.

It can be written as a sum of positive squares in 6 ways, for example, as 48762289 + 257409936 = 6983^2 + 16044^2 .

It is not a de Polignac number, because 306172225 - 2¹¹ = 306170177 is a prime.

It is a super-2 number, since 2×306172225² = 187482862722901250, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 306172193 and 306172202.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 164574 + ... + 166423.

Almost surely, 2^306172225 is an apocalyptic number.

It is an amenable number.

306172225 is a deficient number, since it is larger than the sum of its proper divisors (83743419).

306172225 is a wasteful number, since it uses less digits than its factorization.

306172225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331044 (or 331039 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 306172225 is about 17497.7777160415. Note that the first 4 decimals coincide. The cubic root of 306172225 is about 673.9928097276.

The spelling of 306172225 in words is "three hundred six million, one hundred seventy-two thousand, two hundred twenty-five".