709861 has 2 divisors, whose sum is σ = 709862. Its totient is φ = 709860.

The previous prime is 709853. The next prime is 709871. The reversal of 709861 is 168907.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 616225 + 93636 = 785^2 + 306^2 .

It is a cyclic number.

It is not a de Polignac number, because 709861 - 2³ = 709853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (709831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 354930 + 354931.

It is an arithmetic number, because the mean of its divisors is an integer number (354931).

2⁷⁰⁹⁸⁶¹ is an apocalyptic number.

It is an amenable number.

709861 is a deficient number, since it is larger than the sum of its proper divisors (1).

709861 is an equidigital number, since it uses as much as digits as its factorization.

709861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 709861 is about 842.5324919551. The cubic root of 709861 is about 89.2053918999.

The spelling of 709861 in words is "seven hundred nine thousand, eight hundred sixty-one".