7218501889 has 4 divisors (see below), whose sum is σ = 7219509040. Its totient is φ = 7217494740.

The previous prime is 7218501881. The next prime is 7218501923. The reversal of 7218501889 is 9881058127.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9881058127 = 53 ⋅186435059.

It is a cyclic number.

It is not a de Polignac number, because 7218501889 - 2³ = 7218501881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7218501881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 492747 + ... + 507184.

It is an arithmetic number, because the mean of its divisors is an integer number (1804877260).

Almost surely, 2^7218501889 is an apocalyptic number.

It is an amenable number.

7218501889 is a deficient number, since it is larger than the sum of its proper divisors (1007151).

7218501889 is an equidigital number, since it uses as much as digits as its factorization.

7218501889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1007150.

The product of its (nonzero) digits is 322560, while the sum is 49.

The square root of 7218501889 is about 84961.7672191439. The cubic root of 7218501889 is about 1932.6313708795.

The spelling of 7218501889 in words is "seven billion, two hundred eighteen million, five hundred one thousand, eight hundred eighty-nine".