109195661 has 2 divisors, whose sum is σ = 109195662. Its totient is φ = 109195660.

The previous prime is 109195649. The next prime is 109195753. The reversal of 109195661 is 166591901.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70879561 + 38316100 = 8419^2 + 6190^2 .

It is a cyclic number.

It is not a de Polignac number, because 109195661 - 2²² = 105001357 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109195631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54597830 + 54597831.

It is an arithmetic number, because the mean of its divisors is an integer number (54597831).

Almost surely, 2^109195661 is an apocalyptic number.

It is an amenable number.

109195661 is a deficient number, since it is larger than the sum of its proper divisors (1).

109195661 is an equidigital number, since it uses as much as digits as its factorization.

109195661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14580, while the sum is 38.

The square root of 109195661 is about 10449.6727699962. The cubic root of 109195661 is about 477.9712712436.

The spelling of 109195661 in words is "one hundred nine million, one hundred ninety-five thousand, six hundred sixty-one".