4997981 has 2 divisors, whose sum is σ = 4997982. Its totient is φ = 4997980.

The previous prime is 4997929. The next prime is 4997989. The reversal of 4997981 is 1897994.

4997981 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4990756 + 7225 = 2234^2 + 85^2 .

It is a cyclic number.

It is not a de Polignac number, because 4997981 - 2⁶ = 4997917 is a prime.

It is a super-2 number, since 2×4997981² = 49959628152722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4997989) 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, 2498990 + 2498991.

It is an arithmetic number, because the mean of its divisors is an integer number (2498991).

Almost surely, 2^4997981 is an apocalyptic number.

It is an amenable number.

4997981 is a deficient number, since it is larger than the sum of its proper divisors (1).

4997981 is an equidigital number, since it uses as much as digits as its factorization.

4997981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 47.

The square root of 4997981 is about 2235.6164697908. The cubic root of 4997981 is about 170.9745752927.

The spelling of 4997981 in words is "four million, nine hundred ninety-seven thousand, nine hundred eighty-one".