109661231 has 2 divisors, whose sum is σ = 109661232. Its totient is φ = 109661230.

The previous prime is 109661219. The next prime is 109661281. The reversal of 109661231 is 132166901.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 109661231 - 2¹⁰ = 109660207 is a prime.

It is a super-2 number, since 2×109661231² = 24051171168870722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 109661194 and 109661203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109661281) 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, 54830615 + 54830616.

It is an arithmetic number, because the mean of its divisors is an integer number (54830616).

Almost surely, 2^109661231 is an apocalyptic number.

109661231 is a deficient number, since it is larger than the sum of its proper divisors (1).

109661231 is an equidigital number, since it uses as much as digits as its factorization.

109661231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 109661231 is about 10471.9258496229. The cubic root of 109661231 is about 478.6496058010.

The spelling of 109661231 in words is "one hundred nine million, six hundred sixty-one thousand, two hundred thirty-one".