1006500561 has 16 divisors (see below), whose sum is σ = 1464729600. Its totient is φ = 609696720.

The previous prime is 1006500559. The next prime is 1006500563. The reversal of 1006500561 is 1650056001.

It is an interprime number because it is at equal distance from previous prime (1006500559) and next prime (1006500563).

It is not a de Polignac number, because 1006500561 - 2¹ = 1006500559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1006500563) 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, 72240 + ... + 85038.

It is an arithmetic number, because the mean of its divisors is an integer number (91545600).

Almost surely, 2^1006500561 is an apocalyptic number.

1006500561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1006500561 is a deficient number, since it is larger than the sum of its proper divisors (458229039).

1006500561 is a wasteful number, since it uses less digits than its factorization.

1006500561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15196.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 1006500561 is about 31725.3929999299. The cubic root of 1006500561 is about 1002.1621752953.

Adding to 1006500561 its reverse (1650056001), we get a palindrome (2656556562).

The spelling of 1006500561 in words is "one billion, six million, five hundred thousand, five hundred sixty-one".