109978789 has 2 divisors, whose sum is σ = 109978790. Its totient is φ = 109978788.

The previous prime is 109978777. The next prime is 109978819. The reversal of 109978789 is 987879901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57532225 + 52446564 = 7585^2 + 7242^2 .

It is a cyclic number.

It is not a de Polignac number, because 109978789 - 2²¹ = 107881637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109978189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54989394 + 54989395.

It is an arithmetic number, because the mean of its divisors is an integer number (54989395).

Almost surely, 2^109978789 is an apocalyptic number.

It is an amenable number.

109978789 is a deficient number, since it is larger than the sum of its proper divisors (1).

109978789 is an equidigital number, since it uses as much as digits as its factorization.

109978789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2286144, while the sum is 58.

The square root of 109978789 is about 10487.0772382013. The cubic root of 109978789 is about 479.1111865124. Note that the first 4 decimals are identical.

It can be divided in two parts, 10 and 9978789, that added together give a palindrome (9978799).

The spelling of 109978789 in words is "one hundred nine million, nine hundred seventy-eight thousand, seven hundred eighty-nine".