87113209 has 2 divisors, whose sum is σ = 87113210. Its totient is φ = 87113208.

The previous prime is 87113197. The next prime is 87113239. The reversal of 87113209 is 90231178.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77792400 + 9320809 = 8820^2 + 3053^2 .

It is a cyclic number.

It is not a de Polignac number, because 87113209 - 2²³ = 78724601 is a prime.

It is a super-2 number, since 2×87113209² = 15177422364555362, which contains 22 as substring.

It is a Chen prime.

It is equal to p_5059390 and since 87113209 and 5059390 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (87113239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43556604 + 43556605.

It is an arithmetic number, because the mean of its divisors is an integer number (43556605).

Almost surely, 2^87113209 is an apocalyptic number.

It is an amenable number.

87113209 is a deficient number, since it is larger than the sum of its proper divisors (1).

87113209 is an equidigital number, since it uses as much as digits as its factorization.

87113209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 87113209 is about 9333.4457195615. The cubic root of 87113209 is about 443.2968759789.

The spelling of 87113209 in words is "eighty-seven million, one hundred thirteen thousand, two hundred nine".