108778861 has 2 divisors, whose sum is σ = 108778862. Its totient is φ = 108778860.

The previous prime is 108778841. The next prime is 108778871. The reversal of 108778861 is 168877801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81540900 + 27237961 = 9030^2 + 5219^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-108778861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (108778841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54389430 + 54389431.

It is an arithmetic number, because the mean of its divisors is an integer number (54389431).

Almost surely, 2^108778861 is an apocalyptic number.

It is an amenable number.

108778861 is a deficient number, since it is larger than the sum of its proper divisors (1).

108778861 is an equidigital number, since it uses as much as digits as its factorization.

108778861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 150528, while the sum is 46.

The square root of 108778861 is about 10429.7104945439. The cubic root of 108778861 is about 477.3623568257.

It can be divided in two parts, 1087788 and 61, that added together give a square (1087849 = 1043²).

The spelling of 108778861 in words is "one hundred eight million, seven hundred seventy-eight thousand, eight hundred sixty-one".