7906521869 has 2 divisors, whose sum is σ = 7906521870. Its totient is φ = 7906521868.

The previous prime is 7906521859. The next prime is 7906521907. The reversal of 7906521869 is 9681256097.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6933892900 + 972628969 = 83270^2 + 31187^2 .

It is a cyclic number.

It is not a de Polignac number, because 7906521869 - 2²⁰ = 7905473293 is a prime.

It is a super-2 number, since 2×7906521869² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 7906521869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7906521809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3953260934 + 3953260935.

It is an arithmetic number, because the mean of its divisors is an integer number (3953260935).

Almost surely, 2^7906521869 is an apocalyptic number.

It is an amenable number.

7906521869 is a deficient number, since it is larger than the sum of its proper divisors (1).

7906521869 is an equidigital number, since it uses as much as digits as its factorization.

7906521869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1632960, while the sum is 53.

The square root of 7906521869 is about 88918.6249837457. The cubic root of 7906521869 is about 1992.1796164071.

The spelling of 7906521869 in words is "seven billion, nine hundred six million, five hundred twenty-one thousand, eight hundred sixty-nine".