105439561 has 2 divisors, whose sum is σ = 105439562. Its totient is φ = 105439560.

The previous prime is 105439547. The next prime is 105439571. The reversal of 105439561 is 165934501.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103144336 + 2295225 = 10156^2 + 1515^2 .

It is a cyclic number.

It is not a de Polignac number, because 105439561 - 2¹⁹ = 104915273 is a prime.

It is a super-2 number, since 2×105439561² = 22235002047745442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (105439501) 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, 52719780 + 52719781.

It is an arithmetic number, because the mean of its divisors is an integer number (52719781).

Almost surely, 2^105439561 is an apocalyptic number.

It is an amenable number.

105439561 is a deficient number, since it is larger than the sum of its proper divisors (1).

105439561 is an equidigital number, since it uses as much as digits as its factorization.

105439561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 105439561 is about 10268.3767461074. The cubic root of 105439561 is about 472.4268035136.

The spelling of 105439561 in words is "one hundred five million, four hundred thirty-nine thousand, five hundred sixty-one".