7198216991 has 16 divisors (see below), whose sum is σ = 8691287040. Its totient is φ = 5830389600.

The previous prime is 7198216981. The next prime is 7198216997. The reversal of 7198216991 is 1996128917.

It is a de Polignac number, because none of the positive numbers 2^k-7198216991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7198216997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 367685 + ... + 386766.

It is an arithmetic number, because the mean of its divisors is an integer number (543205440).

Almost surely, 2^7198216991 is an apocalyptic number.

7198216991 is a deficient number, since it is larger than the sum of its proper divisors (1493070049).

7198216991 is a wasteful number, since it uses less digits than its factorization.

7198216991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754534.

The product of its digits is 489888, while the sum is 53.

The square root of 7198216991 is about 84842.3066105584. The cubic root of 7198216991 is about 1930.8193601016.

The spelling of 7198216991 in words is "seven billion, one hundred ninety-eight million, two hundred sixteen thousand, nine hundred ninety-one".