8781349 has 2 divisors, whose sum is σ = 8781350. Its totient is φ = 8781348.

The previous prime is 8781347. The next prime is 8781359. The reversal of 8781349 is 9431878.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6477025 + 2304324 = 2545^2 + 1518^2 .

It is a cyclic number.

It is not a de Polignac number, because 8781349 - 2¹ = 8781347 is a prime.

It is a super-2 number, since 2×8781349² = 154224180519602, which contains 22 as substring.

Together with 8781347, it forms a pair of twin primes.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8781341) 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, 4390674 + 4390675.

It is an arithmetic number, because the mean of its divisors is an integer number (4390675).

Almost surely, 2^8781349 is an apocalyptic number.

It is an amenable number.

8781349 is a deficient number, since it is larger than the sum of its proper divisors (1).

8781349 is an equidigital number, since it uses as much as digits as its factorization.

8781349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 40.

The square root of 8781349 is about 2963.3341019872. The cubic root of 8781349 is about 206.3100634373.

The spelling of 8781349 in words is "eight million, seven hundred eighty-one thousand, three hundred forty-nine".