7213440561 has 64 divisors (see below), whose sum is σ = 10858199040. Its totient is φ = 4237332480.

The previous prime is 7213440547. The next prime is 7213440569. The reversal of 7213440561 is 1650443127.

It is not a de Polignac number, because 7213440561 - 2⁹ = 7213440049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7213440569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 18543355 + ... + 18543743.

It is an arithmetic number, because the mean of its divisors is an integer number (169659360).

Almost surely, 2^7213440561 is an apocalyptic number.

It is an amenable number.

7213440561 is a deficient number, since it is larger than the sum of its proper divisors (3644758479).

7213440561 is a wasteful number, since it uses less digits than its factorization.

7213440561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 7213440561 is about 84931.9760808613. The cubic root of 7213440561 is about 1932.1795703772.

Adding to 7213440561 its reverse (1650443127), we get a palindrome (8863883688).

The spelling of 7213440561 in words is "seven billion, two hundred thirteen million, four hundred forty thousand, five hundred sixty-one".