87654893561 has 2 divisors, whose sum is σ = 87654893562. Its totient is φ = 87654893560.

The previous prime is 87654893509. The next prime is 87654893663. The reversal of 87654893561 is 16539845678.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54070665961 + 33584227600 = 232531^2 + 183260^2 .

It is a cyclic number.

It is not a de Polignac number, because 87654893561 - 2³⁴ = 70475024377 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 87654893494 and 87654893503.

It is not a weakly prime, because it can be changed into another prime (87654893461) 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, 43827446780 + 43827446781.

It is an arithmetic number, because the mean of its divisors is an integer number (43827446781).

Almost surely, 2^87654893561 is an apocalyptic number.

It is an amenable number.

87654893561 is a deficient number, since it is larger than the sum of its proper divisors (1).

87654893561 is an equidigital number, since it uses as much as digits as its factorization.

87654893561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43545600, while the sum is 62.

The spelling of 87654893561 in words is "eighty-seven billion, six hundred fifty-four million, eight hundred ninety-three thousand, five hundred sixty-one".