1003312561 has 4 divisors (see below), whose sum is σ = 1016012800. Its totient is φ = 990612324.

The previous prime is 1003312469. The next prime is 1003312577. The reversal of 1003312561 is 1652133001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1652133001 = 191 ⋅8649911.

It is a cyclic number.

It is not a de Polignac number, because 1003312561 - 2²⁷ = 869094833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1003312591) 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, 6350001 + ... + 6350158.

It is an arithmetic number, because the mean of its divisors is an integer number (254003200).

Almost surely, 2^1003312561 is an apocalyptic number.

It is an amenable number.

1003312561 is a deficient number, since it is larger than the sum of its proper divisors (12700239).

1003312561 is an equidigital number, since it uses as much as digits as its factorization.

1003312561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12700238.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 1003312561 is about 31675.1094867879. The cubic root of 1003312561 is about 1001.1029700099.

Adding to 1003312561 its reverse (1652133001), we get a palindrome (2655445562).

The spelling of 1003312561 in words is "one billion, three million, three hundred twelve thousand, five hundred sixty-one".