5644981 has 2 divisors, whose sum is σ = 5644982. Its totient is φ = 5644980.

The previous prime is 5644967. The next prime is 5644987. The reversal of 5644981 is 1894465.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5640625 + 4356 = 2375^2 + 66^2 .

It is a cyclic number.

It is not a de Polignac number, because 5644981 - 2¹³ = 5636789 is a prime.

It is a super-2 number, since 2×5644981² = 63731620980722, 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 5644981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5644987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2822490 + 2822491.

It is an arithmetic number, because the mean of its divisors is an integer number (2822491).

Almost surely, 2^5644981 is an apocalyptic number.

It is an amenable number.

5644981 is a deficient number, since it is larger than the sum of its proper divisors (1).

5644981 is an equidigital number, since it uses as much as digits as its factorization.

5644981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 37.

The square root of 5644981 is about 2375.9168756503. The cubic root of 5644981 is about 178.0549950004.

The spelling of 5644981 in words is "five million, six hundred forty-four thousand, nine hundred eighty-one".