87218009243 has 2 divisors, whose sum is σ = 87218009244. Its totient is φ = 87218009242.

The previous prime is 87218009231. The next prime is 87218009273. The reversal of 87218009243 is 34290081278.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87218009243 - 2¹⁴ = 87217992859 is a prime.

It is a super-2 number, since 2×87218009243² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 87218009194 and 87218009203.

It is not a weakly prime, because it can be changed into another prime (87218009273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43609004621 + 43609004622.

It is an arithmetic number, because the mean of its divisors is an integer number (43609004622).

Almost surely, 2^87218009243 is an apocalyptic number.

87218009243 is a deficient number, since it is larger than the sum of its proper divisors (1).

87218009243 is an equidigital number, since it uses as much as digits as its factorization.

87218009243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 44.

The spelling of 87218009243 in words is "eighty-seven billion, two hundred eighteen million, nine thousand, two hundred forty-three".