7219391089 has 3 divisors (see below), whose sum is σ = 7219476057. Its totient is φ = 7219306122.

The previous prime is 7219391077. The next prime is 7219391119. The reversal of 7219391089 is 9801939127.

The square root of 7219391089 is 84967.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a de Polignac number, because none of the positive numbers 2^k-7219391089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7219391059) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 42484 + ... + 127450.

It is an arithmetic number, because the mean of its divisors is an integer number (2406492019).

Almost surely, 2^7219391089 is an apocalyptic number.

7219391089 is the 84967-th square number.

7219391089 is the 42484-th centered octagonal number.

It is an amenable number.

7219391089 is a deficient number, since it is larger than the sum of its proper divisors (84968).

7219391089 is an frugal number, since it uses more digits than its factorization.

7219391089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169934 (or 84967 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 49.

The cubic root of 7219391089 is about 1932.7107236909.

Multiplying 7219391089 by its sum of digits (49), we get a square (353750163361 = 594769²).

The spelling of 7219391089 in words is "seven billion, two hundred nineteen million, three hundred ninety-one thousand, eighty-nine".