561501003 has 16 divisors (see below), whose sum is σ = 856016640. Its totient is φ = 320709216.

The previous prime is 561500999. The next prime is 561501019. The reversal of 561501003 is 300105165.

It is a happy number.

It is not a de Polignac number, because 561501003 - 2² = 561500999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (561501043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53776 + ... + 63362.

It is an arithmetic number, because the mean of its divisors is an integer number (53501040).

Almost surely, 2^561501003 is an apocalyptic number.

561501003 is a deficient number, since it is larger than the sum of its proper divisors (294515637).

561501003 is a wasteful number, since it uses less digits than its factorization.

561501003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12386.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 561501003 is about 23696.0123860535. The cubic root of 561501003 is about 824.9928388726.

Adding to 561501003 its reverse (300105165), we get a palindrome (861606168).

The spelling of 561501003 in words is "five hundred sixty-one million, five hundred one thousand, three".