6501561121 has 8 divisors (see below), whose sum is σ = 7099653600. Its totient is φ = 5904642240.

The previous prime is 6501561097. The next prime is 6501561137. The reversal of 6501561121 is 1211651056.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6501561121 - 2¹⁷ = 6501430049 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6501561121.

It is not an unprimeable number, because it can be changed into a prime (6501561191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 281791 + ... + 303988.

It is an arithmetic number, because the mean of its divisors is an integer number (887456700).

Almost surely, 2^6501561121 is an apocalyptic number.

It is an amenable number.

6501561121 is a deficient number, since it is larger than the sum of its proper divisors (598092479).

6501561121 is a wasteful number, since it uses less digits than its factorization.

6501561121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586799.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 6501561121 is about 80632.2585631830. The cubic root of 6501561121 is about 1866.4049741811.

The spelling of 6501561121 in words is "six billion, five hundred one million, five hundred sixty-one thousand, one hundred twenty-one".