3120998996561 has 2 divisors, whose sum is σ = 3120998996562. Its totient is φ = 3120998996560.

The previous prime is 3120998996527. The next prime is 3120998996569. The reversal of 3120998996561 is 1656998990213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1752697971025 + 1368301025536 = 1323895^2 + 1169744^2 .

It is a cyclic number.

It is not a de Polignac number, because 3120998996561 - 2⁶ = 3120998996497 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3120998996491 and 3120998996500.

It is not a weakly prime, because it can be changed into another prime (3120998996569) 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 as a sum of consecutive naturals, namely, 1560499498280 + 1560499498281.

It is an arithmetic number, because the mean of its divisors is an integer number (1560499498281).

Almost surely, 2^{3120998996561} is an apocalyptic number.

It is an amenable number.

3120998996561 is a deficient number, since it is larger than the sum of its proper divisors (1).

3120998996561 is an equidigital number, since it uses as much as digits as its factorization.

3120998996561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56687040, while the sum is 68.

The spelling of 3120998996561 in words is "three trillion, one hundred twenty billion, nine hundred ninety-eight million, nine hundred ninety-six thousand, five hundred sixty-one".