7009991 has 2 divisors, whose sum is σ = 7009992. Its totient is φ = 7009990.

The previous prime is 7009979. The next prime is 7009997. The reversal of 7009991 is 1999007.

It is a happy number.

7009991 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (1999007) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7009991 - 2¹⁴ = 6993607 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7009997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3504995 + 3504996.

It is an arithmetic number, because the mean of its divisors is an integer number (3504996).

Almost surely, 2^7009991 is an apocalyptic number.

7009991 is a deficient number, since it is larger than the sum of its proper divisors (1).

7009991 is an equidigital number, since it uses as much as digits as its factorization.

7009991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5103, while the sum is 35.

The square root of 7009991 is about 2647.6387593477. The cubic root of 7009991 is about 191.3840849908.

It can be divided in two parts, 7009 and 991, that added together give a cube (8000 = 20³).

The spelling of 7009991 in words is "seven million, nine thousand, nine hundred ninety-one".