7081690909 has 2 divisors, whose sum is σ = 7081690910. Its totient is φ = 7081690908.

The previous prime is 7081690897. The next prime is 7081690919. The reversal of 7081690909 is 9090961807.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7035518884 + 46172025 = 83878^2 + 6795^2 .

It is a cyclic number.

It is not a de Polignac number, because 7081690909 - 2²⁵ = 7048136477 is a prime.

It is a super-2 number, since 2×7081690909² (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 (7081690919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3540845454 + 3540845455.

It is an arithmetic number, because the mean of its divisors is an integer number (3540845455).

Almost surely, 2^7081690909 is an apocalyptic number.

It is an amenable number.

7081690909 is a deficient number, since it is larger than the sum of its proper divisors (1).

7081690909 is an equidigital number, since it uses as much as digits as its factorization.

7081690909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 244944, while the sum is 49.

The square root of 7081690909 is about 84152.7831328234. The cubic root of 7081690909 is about 1920.3438067952.

The spelling of 7081690909 in words is "seven billion, eighty-one million, six hundred ninety thousand, nine hundred nine".