87185389 has 2 divisors, whose sum is σ = 87185390. Its totient is φ = 87185388.

The previous prime is 87185383. The next prime is 87185453. The reversal of 87185389 is 98358178.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59444100 + 27741289 = 7710^2 + 5267^2 .

It is a cyclic number.

It is not a de Polignac number, because 87185389 - 2¹⁵ = 87152621 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87185383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43592694 + 43592695.

It is an arithmetic number, because the mean of its divisors is an integer number (43592695).

Almost surely, 2^87185389 is an apocalyptic number.

It is an amenable number.

87185389 is a deficient number, since it is larger than the sum of its proper divisors (1).

87185389 is an equidigital number, since it uses as much as digits as its factorization.

87185389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 49.

The square root of 87185389 is about 9337.3116580738. The cubic root of 87185389 is about 443.4192773750.

The spelling of 87185389 in words is "eighty-seven million, one hundred eighty-five thousand, three hundred eighty-nine".