708539981 has 2 divisors, whose sum is σ = 708539982. Its totient is φ = 708539980.

The previous prime is 708539929. The next prime is 708540023. The reversal of 708539981 is 189935807.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 365956900 + 342583081 = 19130^2 + 18509^2 .

It is a cyclic number.

It is not a de Polignac number, because 708539981 - 2⁶ = 708539917 is a prime.

It is a super-2 number, since 2×708539981² = 1004057809350960722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (708539911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 354269990 + 354269991.

It is an arithmetic number, because the mean of its divisors is an integer number (354269991).

Almost surely, 2^708539981 is an apocalyptic number.

It is an amenable number.

708539981 is a deficient number, since it is larger than the sum of its proper divisors (1).

708539981 is an equidigital number, since it uses as much as digits as its factorization.

708539981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 50.

The square root of 708539981 is about 26618.4143216684. The cubic root of 708539981 is about 891.5002181442.

The spelling of 708539981 in words is "seven hundred eight million, five hundred thirty-nine thousand, nine hundred eighty-one".