109681961 has 2 divisors, whose sum is σ = 109681962. Its totient is φ = 109681960.

The previous prime is 109681933. The next prime is 109681967. The reversal of 109681961 is 169186901.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109327936 + 354025 = 10456^2 + 595^2 .

It is a cyclic number.

It is not a de Polignac number, because 109681961 - 2¹⁰ = 109680937 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (109681967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54840980 + 54840981.

It is an arithmetic number, because the mean of its divisors is an integer number (54840981).

Almost surely, 2^109681961 is an apocalyptic number.

It is an amenable number.

109681961 is a deficient number, since it is larger than the sum of its proper divisors (1).

109681961 is an equidigital number, since it uses as much as digits as its factorization.

109681961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 109681961 is about 10472.9155921357. The cubic root of 109681961 is about 478.6797646854.

The spelling of 109681961 in words is "one hundred nine million, six hundred eighty-one thousand, nine hundred sixty-one".