2249981 has 2 divisors, whose sum is σ = 2249982. Its totient is φ = 2249980.

The previous prime is 2249969. The next prime is 2249983. The reversal of 2249981 is 1899422.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1229881 + 1020100 = 1109^2 + 1010^2 .

It is a cyclic number.

It is not a de Polignac number, because 2249981 - 2⁶ = 2249917 is a prime.

It is a super-2 number, since 2×2249981² = 10124829000722, which contains 22 as substring.

Together with 2249983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2249983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1124990 + 1124991.

It is an arithmetic number, because the mean of its divisors is an integer number (1124991).

2^2249981 is an apocalyptic number.

It is an amenable number.

2249981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2249981 is an equidigital number, since it uses as much as digits as its factorization.

2249981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 35.

The square root of 2249981 is about 1499.9936666533. The cubic root of 2249981 is about 131.0367008643.

The spelling of 2249981 in words is "two million, two hundred forty-nine thousand, nine hundred eighty-one".