4921972981 has 2 divisors, whose sum is σ = 4921972982. Its totient is φ = 4921972980.

The previous prime is 4921972969. The next prime is 4921972987. The reversal of 4921972981 is 1892791294.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4692935025 + 229037956 = 68505^2 + 15134^2 .

It is a cyclic number.

It is not a de Polignac number, because 4921972981 - 2⁵ = 4921972949 is a prime.

It is a super-2 number, since 2×4921972981² = 48451636051388052722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4921972987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2460986490 + 2460986491.

It is an arithmetic number, because the mean of its divisors is an integer number (2460986491).

Almost surely, 2^4921972981 is an apocalyptic number.

It is an amenable number.

4921972981 is a deficient number, since it is larger than the sum of its proper divisors (1).

4921972981 is an equidigital number, since it uses as much as digits as its factorization.

4921972981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 52.

The square root of 4921972981 is about 70156.7743058359. The cubic root of 4921972981 is about 1701.0343164775.

The spelling of 4921972981 in words is "four billion, nine hundred twenty-one million, nine hundred seventy-two thousand, nine hundred eighty-one".