709991 has 2 divisors, whose sum is σ = 709992. Its totient is φ = 709990.

The previous prime is 709981. The next prime is 710009. The reversal of 709991 is 199907.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 709991 - 2⁶ = 709927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (709901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 354995 + 354996.

It is an arithmetic number, because the mean of its divisors is an integer number (354996).

2⁷⁰⁹⁹⁹¹ is an apocalyptic number.

709991 is a deficient number, since it is larger than the sum of its proper divisors (1).

709991 is an equidigital number, since it uses as much as digits as its factorization.

709991 is an evil number, because the sum of its binary digits is even.

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

The square root of 709991 is about 842.6096367832. The cubic root of 709991 is about 89.2108370942.

The spelling of 709991 in words is "seven hundred nine thousand, nine hundred ninety-one".