2029981 has 2 divisors, whose sum is σ = 2029982. Its totient is φ = 2029980.

The previous prime is 2029967. The next prime is 2029991. The reversal of 2029981 is 1899202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1865956 + 164025 = 1366^2 + 405^2 .

It is a cyclic number.

It is not a de Polignac number, because 2029981 - 2¹⁵ = 1997213 is a prime.

It is a super-2 number, since 2×2029981² = 8241645720722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2029921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1014990 + 1014991.

It is an arithmetic number, because the mean of its divisors is an integer number (1014991).

2^2029981 is an apocalyptic number.

It is an amenable number.

2029981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2029981 is an equidigital number, since it uses as much as digits as its factorization.

2029981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 2029981 is about 1424.7740171690. The cubic root of 2029981 is about 126.6185466648.

The spelling of 2029981 in words is "two million, twenty-nine thousand, nine hundred eighty-one".