4249981 has 2 divisors, whose sum is σ = 4249982. Its totient is φ = 4249980.

The previous prime is 4249969. The next prime is 4250021. The reversal of 4249981 is 1899424.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3006756 + 1243225 = 1734^2 + 1115^2 .

It is a cyclic number.

It is not a de Polignac number, because 4249981 - 2⁷ = 4249853 is a prime.

It is a super-2 number, since 2×4249981² = 36124677000722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 4249981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4249951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2124990 + 2124991.

It is an arithmetic number, because the mean of its divisors is an integer number (2124991).

Almost surely, 2^4249981 is an apocalyptic number.

It is an amenable number.

4249981 is a deficient number, since it is larger than the sum of its proper divisors (1).

4249981 is an equidigital number, since it uses as much as digits as its factorization.

4249981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 37.

The square root of 4249981 is about 2061.5482046268. The cubic root of 4249981 is about 161.9803486807.

The spelling of 4249981 in words is "four million, two hundred forty-nine thousand, nine hundred eighty-one".