709981 has 2 divisors, whose sum is σ = 709982. Its totient is φ = 709980.

The previous prime is 709967. The next prime is 709991. The reversal of 709981 is 189907.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 401956 + 308025 = 634^2 + 555^2 .

It is a cyclic number.

It is not a de Polignac number, because 709981 - 2⁷ = 709853 is a prime.

It is a super-4 number, since 4×709981⁴ (a number of 25 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

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, 354990 + 354991.

It is an arithmetic number, because the mean of its divisors is an integer number (354991).

2⁷⁰⁹⁹⁸¹ is an apocalyptic number.

It is an amenable number.

709981 is a deficient number, since it is larger than the sum of its proper divisors (1).

709981 is an equidigital number, since it uses as much as digits as its factorization.

709981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 709981 is about 842.6037028165. The cubic root of 709981 is about 89.2104182567.

The spelling of 709981 in words is "seven hundred nine thousand, nine hundred eighty-one".