6321940561 has 2 divisors, whose sum is σ = 6321940562. Its totient is φ = 6321940560.

The previous prime is 6321940543. The next prime is 6321940567. The reversal of 6321940561 is 1650491236.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6234049936 + 87890625 = 78956^2 + 9375^2 .

It is a cyclic number.

It is not a de Polignac number, because 6321940561 - 2¹⁹ = 6321416273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6321940561.

It is not a weakly prime, because it can be changed into another prime (6321940567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3160970280 + 3160970281.

It is an arithmetic number, because the mean of its divisors is an integer number (3160970281).

Almost surely, 2^6321940561 is an apocalyptic number.

It is an amenable number.

6321940561 is a deficient number, since it is larger than the sum of its proper divisors (1).

6321940561 is an equidigital number, since it uses as much as digits as its factorization.

6321940561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 6321940561 is about 79510.6317482134. The cubic root of 6321940561 is about 1849.0563057452.

The spelling of 6321940561 in words is "six billion, three hundred twenty-one million, nine hundred forty thousand, five hundred sixty-one".