1981225485 has 24 divisors (see below), whose sum is σ = 3469535160. Its totient is φ = 1045757952.

The previous prime is 1981225483. The next prime is 1981225501. The reversal of 1981225485 is 5845221891.

1981225485 is a `hidden beast` number, since 1 + 9 + 81 + 22 + 548 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 502746084 + 1478479401 = 22422^2 + 38451^2 .

It is not a de Polignac number, because 1981225485 - 2¹ = 1981225483 is a prime.

It is a super-3 number, since 3×1981225485³ (a number of 29 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1981225485.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981225483) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 222580 + ... + 231309.

It is an arithmetic number, because the mean of its divisors is an integer number (144563965).

Almost surely, 2^1981225485 is an apocalyptic number.

1981225485 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1981225485 is a deficient number, since it is larger than the sum of its proper divisors (1488309675).

1981225485 is a wasteful number, since it uses less digits than its factorization.

1981225485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453997 (or 453994 counting only the distinct ones).

The product of its digits is 230400, while the sum is 45.

The square root of 1981225485 is about 44510.9591561449. The cubic root of 1981225485 is about 1255.9662479351.

The spelling of 1981225485 in words is "one billion, nine hundred eighty-one million, two hundred twenty-five thousand, four hundred eighty-five".