31971228025 has 27 divisors (see below), whose sum is σ = 43589399119. Its totient is φ = 23244650000.

The previous prime is 31971228019. The next prime is 31971228059. The reversal of 31971228025 is 52082217913.

The square root of 31971228025 is 178805.

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., 11509642089 + 20461585936 = 107283^2 + 143044^2 .

It is not a de Polignac number, because 31971228025 - 2²³ = 31962839417 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 (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 9832650 + ... + 9835900.

Almost surely, 2^31971228025 is an apocalyptic number.

31971228025 is the 178805-th square number.

31971228025 is the 89403-rd centered octagonal number.

It is an amenable number.

31971228025 is a deficient number, since it is larger than the sum of its proper divisors (11618171094).

31971228025 is an frugal number, since it uses more digits than its factorization.

31971228025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6534 (or 3267 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 31971228025 in words is "thirty-one billion, nine hundred seventy-one million, two hundred twenty-eight thousand, twenty-five".