997612225 has 9 divisors (see below), whose sum is σ = 1237235017. Its totient is φ = 797963440.

The previous prime is 997612223. The next prime is 997612229. The reversal of 997612225 is 522216799.

The square root of 997612225 is 31585.

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

It can be written as a sum of positive squares in 4 ways, for example, as 10647169 + 986965056 = 3263^2 + 31416^2 .

It is not a de Polignac number, because 997612225 - 2¹ = 997612223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997612223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 154767 + ... + 161083.

Almost surely, 2^997612225 is an apocalyptic number.

997612225 is the 31585-th square number.

997612225 is the 15793-rd centered octagonal number.

It is an amenable number.

997612225 is a deficient number, since it is larger than the sum of its proper divisors (239622792).

997612225 is an frugal number, since it uses more digits than its factorization.

997612225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12644 (or 6322 counting only the distinct ones).

The product of its digits is 136080, while the sum is 43.

The cubic root of 997612225 is about 999.2034406617.

It can be divided in two parts, 9976 and 12225, that added together give a square (22201 = 149²).

The spelling of 997612225 in words is "nine hundred ninety-seven million, six hundred twelve thousand, two hundred twenty-five".