87567261209 has 2 divisors, whose sum is σ = 87567261210. Its totient is φ = 87567261208.

The previous prime is 87567261203. The next prime is 87567261217. The reversal of 87567261209 is 90216276578.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78289718809 + 9277542400 = 279803^2 + 96320^2 .

It is a cyclic number.

It is not a de Polignac number, because 87567261209 - 2⁸ = 87567260953 is a prime.

It is a super-4 number, since 4×87567261209⁴ (a number of 45 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (87567261203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43783630604 + 43783630605.

It is an arithmetic number, because the mean of its divisors is an integer number (43783630605).

Almost surely, 2^87567261209 is an apocalyptic number.

It is an amenable number.

87567261209 is a deficient number, since it is larger than the sum of its proper divisors (1).

87567261209 is an equidigital number, since it uses as much as digits as its factorization.

87567261209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2540160, while the sum is 53.

The spelling of 87567261209 in words is "eighty-seven billion, five hundred sixty-seven million, two hundred sixty-one thousand, two hundred nine".