28894295401561 has 2 divisors, whose sum is σ = 28894295401562. Its totient is φ = 28894295401560.

The previous prime is 28894295401549. The next prime is 28894295401571. The reversal of 28894295401561 is 16510459249882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24152614949961 + 4741680451600 = 4914531^2 + 2177540^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28894295401561 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28894295401493 and 28894295401502.

It is not a weakly prime, because it can be changed into another prime (28894295401571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14447147700780 + 14447147700781.

It is an arithmetic number, because the mean of its divisors is an integer number (14447147700781).

Almost surely, 2^{28894295401561} is an apocalyptic number.

It is an amenable number.

28894295401561 is a deficient number, since it is larger than the sum of its proper divisors (1).

28894295401561 is an equidigital number, since it uses as much as digits as its factorization.

28894295401561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 49766400, while the sum is 64.

The spelling of 28894295401561 in words is "twenty-eight trillion, eight hundred ninety-four billion, two hundred ninety-five million, four hundred one thousand, five hundred sixty-one".