4990981 has 2 divisors, whose sum is σ = 4990982. Its totient is φ = 4990980.

The previous prime is 4990961. The next prime is 4991009. The reversal of 4990981 is 1890994.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4990756 + 225 = 2234^2 + 15^2 .

It is a cyclic number.

It is not a de Polignac number, because 4990981 - 2⁵ = 4990949 is a prime.

It is a super-2 number, since 2×4990981² = 49819782684722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4990961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2495490 + 2495491.

It is an arithmetic number, because the mean of its divisors is an integer number (2495491).

Almost surely, 2^4990981 is an apocalyptic number.

It is an amenable number.

4990981 is a deficient number, since it is larger than the sum of its proper divisors (1).

4990981 is an equidigital number, since it uses as much as digits as its factorization.

4990981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 4990981 is about 2234.0503575345. The cubic root of 4990981 is about 170.8947176326.

The spelling of 4990981 in words is "four million, nine hundred ninety thousand, nine hundred eighty-one".