1981025 has 6 divisors (see below), whose sum is σ = 2456502. Its totient is φ = 1584800.

The previous prime is 1980991. The next prime is 1981037. The reversal of 1981025 is 5201891.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 524176 + 1456849 = 724^2 + 1207^2 .

It is not a de Polignac number, because 1981025 - 2¹² = 1976929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1980985 and 1981003.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39596 + ... + 39645.

It is an arithmetic number, because the mean of its divisors is an integer number (409417).

2^1981025 is an apocalyptic number.

It is an amenable number.

1981025 is a deficient number, since it is larger than the sum of its proper divisors (475477).

1981025 is an equidigital number, since it uses as much as digits as its factorization.

1981025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79251 (or 79246 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 1981025 is about 1407.4888987129. The cubic root of 1981025 is about 125.5923881752.

The spelling of 1981025 in words is "one million, nine hundred eighty-one thousand, twenty-five".