87185867 has 2 divisors, whose sum is σ = 87185868. Its totient is φ = 87185866.

The previous prime is 87185807. The next prime is 87185869. The reversal of 87185867 is 76858178.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87185867 - 2¹⁰ = 87184843 is a prime.

Together with 87185869, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87185869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43592933 + 43592934.

It is an arithmetic number, because the mean of its divisors is an integer number (43592934).

Almost surely, 2^87185867 is an apocalyptic number.

87185867 is a deficient number, since it is larger than the sum of its proper divisors (1).

87185867 is an equidigital number, since it uses as much as digits as its factorization.

87185867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 752640, while the sum is 50.

The square root of 87185867 is about 9337.3372542712. The cubic root of 87185867 is about 443.4200877326.

The spelling of 87185867 in words is "eighty-seven million, one hundred eighty-five thousand, eight hundred sixty-seven".