4972643981 has 4 divisors (see below), whose sum is σ = 4972891392. Its totient is φ = 4972396572.

The previous prime is 4972643947. The next prime is 4972644013. The reversal of 4972643981 is 1893462794.

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: 1893462794 = 2 ⋅946731397.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4972643981 is a prime.

It is a super-2 number, since 2×4972643981² = 49454376323551056722, 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 (4972643911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90605 + ... + 134738.

It is an arithmetic number, because the mean of its divisors is an integer number (1243222848).

Almost surely, 2^4972643981 is an apocalyptic number.

It is an amenable number.

4972643981 is a deficient number, since it is larger than the sum of its proper divisors (247411).

4972643981 is a wasteful number, since it uses less digits than its factorization.

4972643981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247410.

The product of its digits is 2612736, while the sum is 53.

The square root of 4972643981 is about 70516.9765446591. The cubic root of 4972643981 is about 1706.8516996336.

The spelling of 4972643981 in words is "four billion, nine hundred seventy-two million, six hundred forty-three thousand, nine hundred eighty-one".