109339781 has 2 divisors, whose sum is σ = 109339782. Its totient is φ = 109339780.

The previous prime is 109339777. The next prime is 109339807. The reversal of 109339781 is 187933901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57988225 + 51351556 = 7615^2 + 7166^2 .

It is a cyclic number.

It is not a de Polignac number, because 109339781 - 2² = 109339777 is a prime.

It is a super-2 number, since 2×109339781² = 23910375418255922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109339721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54669890 + 54669891.

It is an arithmetic number, because the mean of its divisors is an integer number (54669891).

Almost surely, 2^109339781 is an apocalyptic number.

It is an amenable number.

109339781 is a deficient number, since it is larger than the sum of its proper divisors (1).

109339781 is an equidigital number, since it uses as much as digits as its factorization.

109339781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 109339781 is about 10456.5664058524. The cubic root of 109339781 is about 478.1814594981.

The spelling of 109339781 in words is "one hundred nine million, three hundred thirty-nine thousand, seven hundred eighty-one".