7969409221 has 2 divisors, whose sum is σ = 7969409222. Its totient is φ = 7969409220.

The previous prime is 7969409167. The next prime is 7969409237. The reversal of 7969409221 is 1229049697.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4126649121 + 3842760100 = 64239^2 + 61990^2 .

It is a cyclic number.

It is not a de Polignac number, because 7969409221 - 2⁹ = 7969408709 is a prime.

It is a super-2 number, since 2×7969409221² (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 (7969409251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3984704610 + 3984704611.

It is an arithmetic number, because the mean of its divisors is an integer number (3984704611).

Almost surely, 2^7969409221 is an apocalyptic number.

It is an amenable number.

7969409221 is a deficient number, since it is larger than the sum of its proper divisors (1).

7969409221 is an equidigital number, since it uses as much as digits as its factorization.

7969409221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 489888, while the sum is 49.

The square root of 7969409221 is about 89271.5476565742. The cubic root of 7969409221 is about 1997.4475122055.

The spelling of 7969409221 in words is "seven billion, nine hundred sixty-nine million, four hundred nine thousand, two hundred twenty-one".