1982521825 has 6 divisors (see below), whose sum is σ = 2458327094. Its totient is φ = 1586017440.

The previous prime is 1982521819. The next prime is 1982521843. The reversal of 1982521825 is 5281252891.

It can be written as a sum of positive squares in 3 ways, for example, as 336759201 + 1645762624 = 18351^2 + 40568^2 .

It is not a de Polignac number, because 1982521825 - 2³ = 1982521817 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39650412 + ... + 39650461.

Almost surely, 2^1982521825 is an apocalyptic number.

It is an amenable number.

1982521825 is a deficient number, since it is larger than the sum of its proper divisors (475805269).

1982521825 is an equidigital number, since it uses as much as digits as its factorization.

1982521825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79300883 (or 79300878 counting only the distinct ones).

The product of its digits is 115200, while the sum is 43.

The square root of 1982521825 is about 44525.5188066349. The cubic root of 1982521825 is about 1256.2401195563.

The spelling of 1982521825 in words is "one billion, nine hundred eighty-two million, five hundred twenty-one thousand, eight hundred twenty-five".