109139197 has 2 divisors, whose sum is σ = 109139198. Its totient is φ = 109139196.

The previous prime is 109139183. The next prime is 109139237. The reversal of 109139197 is 791931901.

It is an a-pointer prime, because the next prime (109139237) can be obtained adding 109139197 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105083001 + 4056196 = 10251^2 + 2014^2 .

It is an emirp because it is prime and its reverse (791931901) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-109139197 is a prime.

It is a super-2 number, since 2×109139197² = 23822728643609618, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109139497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54569598 + 54569599.

It is an arithmetic number, because the mean of its divisors is an integer number (54569599).

Almost surely, 2^109139197 is an apocalyptic number.

It is an amenable number.

109139197 is a deficient number, since it is larger than the sum of its proper divisors (1).

109139197 is an equidigital number, since it uses as much as digits as its factorization.

109139197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15309, while the sum is 40.

The square root of 109139197 is about 10446.9707092535. The cubic root of 109139197 is about 477.8888722950. Note that the first 4 decimals are identical.

The spelling of 109139197 in words is "one hundred nine million, one hundred thirty-nine thousand, one hundred ninety-seven".