7820949109 has 2 divisors, whose sum is σ = 7820949110. Its totient is φ = 7820949108.

The previous prime is 7820949067. The next prime is 7820949113. The reversal of 7820949109 is 9019490287.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7309737009 + 511212100 = 85497^2 + 22610^2 .

It is a cyclic number.

It is not a de Polignac number, because 7820949109 - 2²³ = 7812560501 is a prime.

It is a super-2 number, since 2×7820949109² (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 (7820949139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3910474554 + 3910474555.

It is an arithmetic number, because the mean of its divisors is an integer number (3910474555).

Almost surely, 2^7820949109 is an apocalyptic number.

It is an amenable number.

7820949109 is a deficient number, since it is larger than the sum of its proper divisors (1).

7820949109 is an equidigital number, since it uses as much as digits as its factorization.

7820949109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 49.

The square root of 7820949109 is about 88436.1301109450. The cubic root of 7820949109 is about 1984.9663705554.

The spelling of 7820949109 in words is "seven billion, eight hundred twenty million, nine hundred forty-nine thousand, one hundred nine".