706988981 has 2 divisors, whose sum is σ = 706988982. Its totient is φ = 706988980.

The previous prime is 706988969. The next prime is 706989011. The reversal of 706988981 is 189889607.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 694322500 + 12666481 = 26350^2 + 3559^2 .

It is a cyclic number.

It is not a de Polignac number, because 706988981 - 2¹⁸ = 706726837 is a prime.

It is a super-2 number, since 2×706988981² = 999666838510836722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (706918981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 353494490 + 353494491.

It is an arithmetic number, because the mean of its divisors is an integer number (353494491).

Almost surely, 2^706988981 is an apocalyptic number.

It is an amenable number.

706988981 is a deficient number, since it is larger than the sum of its proper divisors (1).

706988981 is an equidigital number, since it uses as much as digits as its factorization.

706988981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1741824, while the sum is 56.

The square root of 706988981 is about 26589.2643937361. The cubic root of 706988981 is about 890.8492424145.

The spelling of 706988981 in words is "seven hundred six million, nine hundred eighty-eight thousand, nine hundred eighty-one".