4999981 has 4 divisors (see below), whose sum is σ = 5714272. Its totient is φ = 4285692.

The previous prime is 4999963. The next prime is 4999999. The reversal of 4999981 is 1899994.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1899994 = 2 ⋅949997.

It is an interprime number because it is at equal distance from previous prime (4999963) and next prime (4999999).

It is a cyclic number.

It is not a de Polignac number, because 4999981 - 2⁵ = 4999949 is a prime.

It is a super-2 number, since 2×4999981² = 49999620000722, 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 (4999961) 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 3 ways as a sum of consecutive naturals, for example, 357135 + ... + 357148.

It is an arithmetic number, because the mean of its divisors is an integer number (1428568).

Almost surely, 2^4999981 is an apocalyptic number.

It is an amenable number.

4999981 is a deficient number, since it is larger than the sum of its proper divisors (714291).

4999981 is an equidigital number, since it uses as much as digits as its factorization.

4999981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714290.

The product of its digits is 209952, while the sum is 49.

The square root of 4999981 is about 2236.0637289666. The cubic root of 4999981 is about 170.9973780704.

The spelling of 4999981 in words is "four million, nine hundred ninety-nine thousand, nine hundred eighty-one".