4919981 has 12 divisors (see below), whose sum is σ = 5491836. Its totient is φ = 4403520.

The previous prime is 4919977. The next prime is 4919983. The reversal of 4919981 is 1899194.

It can be written as a sum of positive squares in 2 ways, for example, as 1464100 + 3455881 = 1210^2 + 1859^2 .

It is not a de Polignac number, because 4919981 - 2² = 4919977 is a prime.

It is a super-2 number, since 2×4919981² = 48412426080722, 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 (4919983) 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 in 11 ways as a sum of consecutive naturals, for example, 8555 + ... + 9111.

It is an arithmetic number, because the mean of its divisors is an integer number (457653).

Almost surely, 2^4919981 is an apocalyptic number.

It is an amenable number.

4919981 is a deficient number, since it is larger than the sum of its proper divisors (571855).

4919981 is a wasteful number, since it uses less digits than its factorization.

4919981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652 (or 641 counting only the distinct ones).

The product of its digits is 23328, while the sum is 41.

The square root of 4919981 is about 2218.1030183470. The cubic root of 4919981 is about 170.0804809241.

The spelling of 4919981 in words is "four million, nine hundred nineteen thousand, nine hundred eighty-one".