2097981 has 20 divisors (see below), whose sum is σ = 3194400. Its totient is φ = 1371816.

The previous prime is 2097967. The next prime is 2097983. The reversal of 2097981 is 1897902.

It is a happy number.

It is not a de Polignac number, because 2097981 - 2⁶ = 2097917 is a prime.

It is a super-2 number, since 2×2097981² = 8803048552722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2097983) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4560 + ... + 4998.

It is an arithmetic number, because the mean of its divisors is an integer number (159720).

2^2097981 is an apocalyptic number.

It is an amenable number.

2097981 is a deficient number, since it is larger than the sum of its proper divisors (1096419).

2097981 is an equidigital number, since it uses as much as digits as its factorization.

2097981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510 (or 501 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 2097981 is about 1448.4408859184. The cubic root of 2097981 is about 128.0168638263.

The spelling of 2097981 in words is "two million, ninety-seven thousand, nine hundred eighty-one".