1006100561 has 4 divisors (see below), whose sum is σ = 1007731812. Its totient is φ = 1004469312.

The previous prime is 1006100551. The next prime is 1006100591. The reversal of 1006100561 is 1650016001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1650016001 = 1213 ⋅1360277.

It can be written as a sum of positive squares in 2 ways, for example, as 200392336 + 805708225 = 14156^2 + 28385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1006100561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1006100551) 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, 814700 + ... + 815933.

It is an arithmetic number, because the mean of its divisors is an integer number (251932953).

Almost surely, 2^1006100561 is an apocalyptic number.

It is an amenable number.

1006100561 is a deficient number, since it is larger than the sum of its proper divisors (1631251).

1006100561 is an equidigital number, since it uses as much as digits as its factorization.

1006100561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1631250.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 1006100561 is about 31719.0882750435. The cubic root of 1006100561 is about 1002.0293990867.

Adding to 1006100561 its reverse (1650016001), we get a palindrome (2656116562).

The spelling of 1006100561 in words is "one billion, six million, one hundred thousand, five hundred sixty-one".