4997111981 has 2 divisors, whose sum is σ = 4997111982. Its totient is φ = 4997111980.

The previous prime is 4997111963. The next prime is 4997111993. The reversal of 4997111981 is 1891117994.

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., 2782562500 + 2214549481 = 52750^2 + 47059^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4997111981 is a prime.

It is a super-2 number, since 2×4997111981² = 49942256301307488722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4997111921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2498555990 + 2498555991.

It is an arithmetic number, because the mean of its divisors is an integer number (2498555991).

Almost surely, 2^4997111981 is an apocalyptic number.

It is an amenable number.

4997111981 is a deficient number, since it is larger than the sum of its proper divisors (1).

4997111981 is an equidigital number, since it uses as much as digits as its factorization.

4997111981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 50.

The square root of 4997111981 is about 70690.2537907454. The cubic root of 4997111981 is about 1709.6466537334.

The spelling of 4997111981 in words is "four billion, nine hundred ninety-seven million, one hundred eleven thousand, nine hundred eighty-one".