1561000106 has 16 divisors (see below), whose sum is σ = 2357337384. Its totient is φ = 775230144.

The previous prime is 1561000097. The next prime is 1561000117. The reversal of 1561000106 is 6010001651.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1559065225 + 1934881 = 39485^2 + 1391^2 .

It is a super-2 number, since 2×1561000106² = 4873442661864022472, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 556700 + ... + 559496.

Almost surely, 2^1561000106 is an apocalyptic number.

1561000106 is a deficient number, since it is larger than the sum of its proper divisors (796337278).

1561000106 is a wasteful number, since it uses less digits than its factorization.

1561000106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4585.

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

The square root of 1561000106 is about 39509.4938717266. The cubic root of 1561000106 is about 1160.0257886657.

Adding to 1561000106 its reverse (6010001651), we get a palindrome (7571001757).

The spelling of 1561000106 in words is "one billion, five hundred sixty-one million, one hundred six", and thus it is an aban number.