100055561 has 2 divisors, whose sum is σ = 100055562. Its totient is φ = 100055560.

The previous prime is 100055531. The next prime is 100055623. The reversal of 100055561 is 165550001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60918025 + 39137536 = 7805^2 + 6256^2 .

It is an emirp because it is prime and its reverse (165550001) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100055561 is a prime.

It is a super-2 number, since 2×100055561² = 20022230574049442, which contains 22 as substring.

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 (100055531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50027780 + 50027781.

It is an arithmetic number, because the mean of its divisors is an integer number (50027781).

Almost surely, 2^100055561 is an apocalyptic number.

It is an amenable number.

100055561 is a deficient number, since it is larger than the sum of its proper divisors (1).

100055561 is an equidigital number, since it uses as much as digits as its factorization.

100055561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 100055561 is about 10002.7776642291. Note that the first 3 decimals coincide. The cubic root of 100055561 is about 464.2448312178.

The spelling of 100055561 in words is "one hundred million, fifty-five thousand, five hundred sixty-one".