105245561 has 4 divisors (see below), whose sum is σ = 105328500. Its totient is φ = 105162624.

The previous prime is 105245537. The next prime is 105245563. The reversal of 105245561 is 165542501.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 87310336 + 17935225 = 9344^2 + 4235^2 .

It is a cyclic number.

It is not a de Polignac number, because 105245561 - 2¹⁴ = 105229177 is a prime.

It is a super-2 number, since 2×105245561² = 22153256220409442, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (105245563) 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, 39536 + ... + 42113.

It is an arithmetic number, because the mean of its divisors is an integer number (26332125).

Almost surely, 2^105245561 is an apocalyptic number.

It is an amenable number.

105245561 is a deficient number, since it is larger than the sum of its proper divisors (82939).

105245561 is an equidigital number, since it uses as much as digits as its factorization.

105245561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82938.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 105245561 is about 10258.9259184381. The cubic root of 105245561 is about 472.1368836566.

The spelling of 105245561 in words is "one hundred five million, two hundred forty-five thousand, five hundred sixty-one".