707981 has 2 divisors, whose sum is σ = 707982. Its totient is φ = 707980.

The previous prime is 707969. The next prime is 707983. The reversal of 707981 is 189707.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 448900 + 259081 = 670^2 + 509^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-707981 is a prime.

It is a super-2 number, since 2×707981² = 1002474192722, which contains 22 as substring.

Together with 707983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (707983) 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, 353990 + 353991.

It is an arithmetic number, because the mean of its divisors is an integer number (353991).

2⁷⁰⁷⁹⁸¹ is an apocalyptic number.

It is an amenable number.

707981 is a deficient number, since it is larger than the sum of its proper divisors (1).

707981 is an equidigital number, since it uses as much as digits as its factorization.

707981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3528, while the sum is 32.

The square root of 707981 is about 841.4160683039. The cubic root of 707981 is about 89.1265715833.

The spelling of 707981 in words is "seven hundred seven thousand, nine hundred eighty-one".