1980081 has 6 divisors (see below), whose sum is σ = 2860130. Its totient is φ = 1320048.

The previous prime is 1980079. The next prime is 1980089. The reversal of 1980081 is 1800891.

It can be written as a sum of positive squares in only one way, i.e., 1461681 + 518400 = 1209^2 + 720^2 .

It is not a de Polignac number, because 1980081 - 2¹ = 1980079 is a prime.

It is a super-2 number, since 2×1980081² = 7841441533122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1980089) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 109996 + ... + 110013.

2^1980081 is an apocalyptic number.

It is an amenable number.

1980081 is a deficient number, since it is larger than the sum of its proper divisors (880049).

1980081 is a wasteful number, since it uses less digits than its factorization.

1980081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220015 (or 220012 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The square root of 1980081 is about 1407.1535097494. The cubic root of 1980081 is about 125.5724358691.

It can be divided in two parts, 19800 and 81, that added together give a square (19881 = 141²).

The spelling of 1980081 in words is "one million, nine hundred eighty thousand, eighty-one".