87827561 has 2 divisors, whose sum is σ = 87827562. Its totient is φ = 87827560.

The previous prime is 87827521. The next prime is 87827581. The reversal of 87827561 is 16572878.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54834025 + 32993536 = 7405^2 + 5744^2 .

It is a cyclic number.

It is not a de Polignac number, because 87827561 - 2¹⁰ = 87826537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87827521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43913780 + 43913781.

It is an arithmetic number, because the mean of its divisors is an integer number (43913781).

Almost surely, 2^87827561 is an apocalyptic number.

It is an amenable number.

87827561 is a deficient number, since it is larger than the sum of its proper divisors (1).

87827561 is an equidigital number, since it uses as much as digits as its factorization.

87827561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 188160, while the sum is 44.

The square root of 87827561 is about 9371.6359831142. The cubic root of 87827561 is about 444.5052971515.

It can be divided in two parts, 87827 and 561, that added together give a palindrome (88388).

The spelling of 87827561 in words is "eighty-seven million, eight hundred twenty-seven thousand, five hundred sixty-one".