108781681 has 2 divisors, whose sum is σ = 108781682. Its totient is φ = 108781680.

The previous prime is 108781661. The next prime is 108781693. The reversal of 108781681 is 186187801.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59907600 + 48874081 = 7740^2 + 6991^2 .

It is a cyclic number.

It is not a de Polignac number, because 108781681 - 2⁵ = 108781649 is a prime.

It is a super-2 number, since 2×108781681² = 23666908242371522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (108781661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54390840 + 54390841.

It is an arithmetic number, because the mean of its divisors is an integer number (54390841).

Almost surely, 2^108781681 is an apocalyptic number.

It is an amenable number.

108781681 is a deficient number, since it is larger than the sum of its proper divisors (1).

108781681 is an equidigital number, since it uses as much as digits as its factorization.

108781681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 40.

The square root of 108781681 is about 10429.8456843810. The cubic root of 108781681 is about 477.3664818619.

The spelling of 108781681 in words is "one hundred eight million, seven hundred eighty-one thousand, six hundred eighty-one".