2259981 has 10 divisors (see below), whose sum is σ = 3376142. Its totient is φ = 1506600.

The previous prime is 2259967. The next prime is 2260009. The reversal of 2259981 is 1899522.

It can be written as a sum of positive squares in only one way, i.e., 2205225 + 54756 = 1485^2 + 234^2 .

It is not a de Polignac number, because 2259981 - 2⁵ = 2259949 is a prime.

It is a super-2 number, since 2×2259981² = 10215028240722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2259281) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 13870 + ... + 14031.

2^2259981 is an apocalyptic number.

It is an amenable number.

2259981 is a deficient number, since it is larger than the sum of its proper divisors (1116161).

2259981 is an equidigital number, since it uses as much as digits as its factorization.

2259981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27913 (or 27904 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 2259981 is about 1503.3233185180. The cubic root of 2259981 is about 131.2305440549.

It can be divided in two parts, 2259 and 981, that added together give a triangular number (3240 = T₈₀).

The spelling of 2259981 in words is "two million, two hundred fifty-nine thousand, nine hundred eighty-one".