109301981 has 2 divisors, whose sum is σ = 109301982. Its totient is φ = 109301980.

The previous prime is 109301977. The next prime is 109301999. The reversal of 109301981 is 189103901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105062500 + 4239481 = 10250^2 + 2059^2 .

It is a cyclic number.

It is not a de Polignac number, because 109301981 - 2² = 109301977 is a prime.

It is a super-2 number, since 2×109301981² = 23893846101048722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen 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 (109301581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54650990 + 54650991.

It is an arithmetic number, because the mean of its divisors is an integer number (54650991).

Almost surely, 2^109301981 is an apocalyptic number.

It is an amenable number.

109301981 is a deficient number, since it is larger than the sum of its proper divisors (1).

109301981 is an equidigital number, since it uses as much as digits as its factorization.

109301981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 32.

The square root of 109301981 is about 10454.7587729225. The cubic root of 109301981 is about 478.1263488990.

The spelling of 109301981 in words is "one hundred nine million, three hundred one thousand, nine hundred eighty-one".