7198216981 has 2 divisors, whose sum is σ = 7198216982. Its totient is φ = 7198216980.

The previous prime is 7198216931. The next prime is 7198216997. The reversal of 7198216981 is 1896128917.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6172616356 + 1025600625 = 78566^2 + 32025^2 .

It is a cyclic number.

It is not a de Polignac number, because 7198216981 - 2²¹ = 7196119829 is a prime.

It is a super-2 number, since 2×7198216981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7198216931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3599108490 + 3599108491.

It is an arithmetic number, because the mean of its divisors is an integer number (3599108491).

Almost surely, 2^7198216981 is an apocalyptic number.

It is an amenable number.

7198216981 is a deficient number, since it is larger than the sum of its proper divisors (1).

7198216981 is an equidigital number, since it uses as much as digits as its factorization.

7198216981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 52.

The square root of 7198216981 is about 84842.3065516255. The cubic root of 7198216981 is about 1930.8193592075.

The spelling of 7198216981 in words is "seven billion, one hundred ninety-eight million, two hundred sixteen thousand, nine hundred eighty-one".