7948181 has 2 divisors, whose sum is σ = 7948182. Its totient is φ = 7948180.

The previous prime is 7948177. The next prime is 7948189. The reversal of 7948181 is 1818497.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6604900 + 1343281 = 2570^2 + 1159^2 .

It is a cyclic number.

It is not a de Polignac number, because 7948181 - 2² = 7948177 is a prime.

It is a super-2 number, since 2×7948181² = 126347162417522, 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 (7948189) 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 as a sum of consecutive naturals, namely, 3974090 + 3974091.

It is an arithmetic number, because the mean of its divisors is an integer number (3974091).

Almost surely, 2^7948181 is an apocalyptic number.

It is an amenable number.

7948181 is a deficient number, since it is larger than the sum of its proper divisors (1).

7948181 is an equidigital number, since it uses as much as digits as its factorization.

7948181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 38.

The square root of 7948181 is about 2819.2518511123. The cubic root of 7948181 is about 199.5672392661.

The spelling of 7948181 in words is "seven million, nine hundred forty-eight thousand, one hundred eighty-one".