8181377 has 2 divisors, whose sum is σ = 8181378. Its totient is φ = 8181376.

The previous prime is 8181361. The next prime is 8181379. The reversal of 8181377 is 7731818.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4145296 + 4036081 = 2036^2 + 2009^2 .

It is a cyclic number.

It is not a de Polignac number, because 8181377 - 2⁴ = 8181361 is a prime.

It is a super-2 number, since 2×8181377² = 133869859232258, which contains 22 as substring.

Together with 8181379, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8181379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4090688 + 4090689.

It is an arithmetic number, because the mean of its divisors is an integer number (4090689).

Almost surely, 2^8181377 is an apocalyptic number.

It is an amenable number.

8181377 is a deficient number, since it is larger than the sum of its proper divisors (1).

8181377 is an equidigital number, since it uses as much as digits as its factorization.

8181377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9408, while the sum is 35.

The square root of 8181377 is about 2860.3106474647. The cubic root of 8181377 is about 201.5001939546.

It can be divided in two parts, 8181 and 377, that added together give a palindrome (8558).

The spelling of 8181377 in words is "eight million, one hundred eighty-one thousand, three hundred seventy-seven".