105242561 has 4 divisors (see below), whose sum is σ = 105288624. Its totient is φ = 105196500.

The previous prime is 105242497. The next prime is 105242569. The reversal of 105242561 is 165242501.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 165242501 = 3313 ⋅49877.

It is a cyclic number.

It is not a de Polignac number, because 105242561 - 2⁶ = 105242497 is a prime.

It is a super-2 number, since 2×105242561² = 22151993291677442, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 105242561.

It is not an unprimeable number, because it can be changed into a prime (105242569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19415 + ... + 24236.

It is an arithmetic number, because the mean of its divisors is an integer number (26322156).

Almost surely, 2^105242561 is an apocalyptic number.

It is an amenable number.

105242561 is a deficient number, since it is larger than the sum of its proper divisors (46063).

105242561 is an equidigital number, since it uses as much as digits as its factorization.

105242561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46062.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 105242561 is about 10258.7797032591. The cubic root of 105242561 is about 472.1323975636.

The spelling of 105242561 in words is "one hundred five million, two hundred forty-two thousand, five hundred sixty-one".