87166439 has 2 divisors, whose sum is σ = 87166440. Its totient is φ = 87166438.

The previous prime is 87166427. The next prime is 87166447. The reversal of 87166439 is 93466178.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87166439 - 2¹⁶ = 87100903 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87166439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87166459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43583219 + 43583220.

It is an arithmetic number, because the mean of its divisors is an integer number (43583220).

Almost surely, 2^87166439 is an apocalyptic number.

87166439 is a deficient number, since it is larger than the sum of its proper divisors (1).

87166439 is an equidigital number, since it uses as much as digits as its factorization.

87166439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 44.

The square root of 87166439 is about 9336.2968568914. The cubic root of 87166439 is about 443.3871488870.

The spelling of 87166439 in words is "eighty-seven million, one hundred sixty-six thousand, four hundred thirty-nine".