561100001 has 16 divisors (see below), whose sum is σ = 736373760. Its totient is φ = 414208080.

The previous prime is 561099997. The next prime is 561100037. The reversal of 561100001 is 100001165.

561100001 = T₂₈₃₈ + T₂₈₃₉ + ... + T₂₉₇₀.

It is not a de Polignac number, because 561100001 - 2² = 561099997 is a prime.

It is a super-2 number, since 2×561100001² = 629666422244400002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561106001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 190301 + ... + 193226.

It is an arithmetic number, because the mean of its divisors is an integer number (46023360).

Almost surely, 2^561100001 is an apocalyptic number.

It is an amenable number.

561100001 is a deficient number, since it is larger than the sum of its proper divisors (175273759).

561100001 is a wasteful number, since it uses less digits than its factorization.

561100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383564.

The product of its (nonzero) digits is 30, while the sum is 14.

The square root of 561100001 is about 23687.5494933520. The cubic root of 561100001 is about 824.7963995896.

Adding to 561100001 its reverse (100001165), we get a palindrome (661101166).

The spelling of 561100001 in words is "five hundred sixty-one million, one hundred thousand, one".