97821225 has 18 divisors (see below), whose sum is σ = 175209086. Its totient is φ = 52171200.

The previous prime is 97821221. The next prime is 97821313. The reversal of 97821225 is 52212879.

It can be written as a sum of positive squares in 3 ways, for example, as 522729 + 97298496 = 723^2 + 9864^2 .

It is not a de Polignac number, because 97821225 - 2² = 97821221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 97821225.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97821221) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 217156 + ... + 217605.

Almost surely, 2^97821225 is an apocalyptic number.

It is an amenable number.

97821225 is a deficient number, since it is larger than the sum of its proper divisors (77387861).

97821225 is a wasteful number, since it uses less digits than its factorization.

97821225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434777 (or 434769 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 97821225 is about 9890.4613138114. The cubic root of 97821225 is about 460.7631079632.

The spelling of 97821225 in words is "ninety-seven million, eight hundred twenty-one thousand, two hundred twenty-five".