39217861225 has 9 divisors (see below), whose sum is σ = 48631375767. Its totient is φ = 31373496840.

The previous prime is 39217861219. The next prime is 39217861237. The reversal of 39217861225 is 52216871293.

The square root of 39217861225 is 198035.

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., 14118430041 + 25099431184 = 118821^2 + 158428^2 .

It is not a de Polignac number, because 39217861225 - 2⁷ = 39217861097 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 970372 + ... + 1009978.

Almost surely, 2^39217861225 is an apocalyptic number.

39217861225 is the 198035-th square number.

39217861225 is the 99018-th centered octagonal number.

It is an amenable number.

39217861225 is a deficient number, since it is larger than the sum of its proper divisors (9413514542).

39217861225 is an frugal number, since it uses more digits than its factorization.

39217861225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79224 (or 39612 counting only the distinct ones).

The product of its digits is 362880, while the sum is 46.

The spelling of 39217861225 in words is "thirty-nine billion, two hundred seventeen million, eight hundred sixty-one thousand, two hundred twenty-five".