7642181 has 2 divisors, whose sum is σ = 7642182. Its totient is φ = 7642180.

The previous prime is 7642171. The next prime is 7642183. The reversal of 7642181 is 1812467.

7642181 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6421156 + 1221025 = 2534^2 + 1105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7642181 is a prime.

It is a super-2 number, since 2×7642181² = 116805860873522, which contains 22 as substring.

Together with 7642183, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7642183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3821090 + 3821091.

It is an arithmetic number, because the mean of its divisors is an integer number (3821091).

Almost surely, 2^7642181 is an apocalyptic number.

It is an amenable number.

7642181 is a deficient number, since it is larger than the sum of its proper divisors (1).

7642181 is an equidigital number, since it uses as much as digits as its factorization.

7642181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 29.

The square root of 7642181 is about 2764.4494931179. The cubic root of 7642181 is about 196.9725798627.

The spelling of 7642181 in words is "seven million, six hundred forty-two thousand, one hundred eighty-one".