2023981 has 2 divisors, whose sum is σ = 2023982. Its totient is φ = 2023980.

The previous prime is 2023963. The next prime is 2023993. The reversal of 2023981 is 1893202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1121481 + 902500 = 1059^2 + 950^2 .

It is a cyclic number.

It is not a de Polignac number, because 2023981 - 2¹¹ = 2021933 is a prime.

It is a super-2 number, since 2×2023981² = 8192998176722, which contains 22 as substring.

It is an Ulam number.

2023981 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2023921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1011990 + 1011991.

It is an arithmetic number, because the mean of its divisors is an integer number (1011991).

2^2023981 is an apocalyptic number.

It is an amenable number.

2023981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2023981 is an equidigital number, since it uses as much as digits as its factorization.

2023981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 2023981 is about 1422.6668619181. Note that the first 3 decimals coincide. The cubic root of 2023981 is about 126.4936750523.

The spelling of 2023981 in words is "two million, twenty-three thousand, nine hundred eighty-one".