308529225 has 27 divisors (see below), whose sum is σ = 553082439. Its totient is φ = 164408400.

The previous prime is 308529217. The next prime is 308529227. The reversal of 308529225 is 522925803.

The square root of 308529225 is 17565.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 111070521 + 197458704 = 10539^2 + 14052^2 .

It is not a de Polignac number, because 308529225 - 2³ = 308529217 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 308529225.

It is not an unprimeable number, because it can be changed into a prime (308529227) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 262890 + ... + 264060.

Almost surely, 2^308529225 is an apocalyptic number.

308529225 is the 17565-th square number.

308529225 is the 8783-rd centered octagonal number.

It is an amenable number.

308529225 is a deficient number, since it is larger than the sum of its proper divisors (244553214).

308529225 is an equidigital number, since it uses as much as digits as its factorization.

308529225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2358 (or 1179 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The cubic root of 308529225 is about 675.7179192893.

Multiplying 308529225 by its sum of digits (36), we get a square (11107052100 = 105390²).

The spelling of 308529225 in words is "three hundred eight million, five hundred twenty-nine thousand, two hundred twenty-five".