1647142225 has 9 divisors (see below), whose sum is σ = 2042708017. Its totient is φ = 1317551440.

The previous prime is 1647142201. The next prime is 1647142229. The reversal of 1647142225 is 5222417461.

The square root of 1647142225 is 40585.

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 174424849 + 1472717376 = 13207^2 + 38376^2 .

It is not a de Polignac number, because 1647142225 - 2⁷ = 1647142097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1647142229) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 198867 + ... + 206983.

Almost surely, 2^1647142225 is an apocalyptic number.

1647142225 is the 40585-th square number.

1647142225 is the 20293-rd centered octagonal number.

It is an amenable number.

1647142225 is a deficient number, since it is larger than the sum of its proper divisors (395565792).

1647142225 is an frugal number, since it uses more digits than its factorization.

1647142225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16244 (or 8122 counting only the distinct ones).

The product of its digits is 26880, while the sum is 34.

The cubic root of 1647142225 is about 1180.9831471709.

Adding to 1647142225 its reverse (5222417461), we get a palindrome (6869559686).

The spelling of 1647142225 in words is "one billion, six hundred forty-seven million, one hundred forty-two thousand, two hundred twenty-five".