7972781 has 2 divisors, whose sum is σ = 7972782. Its totient is φ = 7972780.

The previous prime is 7972777. The next prime is 7972817. The reversal of 7972781 is 1872797.

Together with next prime (7972817) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7070281 + 902500 = 2659^2 + 950^2 .

It is a cyclic number.

It is not a de Polignac number, because 7972781 - 2² = 7972777 is a prime.

It is a super-2 number, since 2×7972781² = 127130473747922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7972771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3986390 + 3986391.

It is an arithmetic number, because the mean of its divisors is an integer number (3986391).

Almost surely, 2^7972781 is an apocalyptic number.

It is an amenable number.

7972781 is a deficient number, since it is larger than the sum of its proper divisors (1).

7972781 is an equidigital number, since it uses as much as digits as its factorization.

7972781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49392, while the sum is 41.

The square root of 7972781 is about 2823.6113401104. The cubic root of 7972781 is about 199.7729172647.

The spelling of 7972781 in words is "seven million, nine hundred seventy-two thousand, seven hundred eighty-one".