87018389 has 2 divisors, whose sum is σ = 87018390. Its totient is φ = 87018388.

The previous prime is 87018377. The next prime is 87018433. The reversal of 87018389 is 98381078.

It is an a-pointer prime, because the next prime (87018433) can be obtained adding 87018389 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81306289 + 5712100 = 9017^2 + 2390^2 .

It is a cyclic number.

It is not a de Polignac number, because 87018389 - 2²⁴ = 70241173 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87018319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43509194 + 43509195.

It is an arithmetic number, because the mean of its divisors is an integer number (43509195).

Almost surely, 2^87018389 is an apocalyptic number.

It is an amenable number.

87018389 is a deficient number, since it is larger than the sum of its proper divisors (1).

87018389 is an equidigital number, since it uses as much as digits as its factorization.

87018389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 87018389 is about 9328.3647548753. The cubic root of 87018389 is about 443.1359793320.

The spelling of 87018389 in words is "eighty-seven million, eighteen thousand, three hundred eighty-nine".