289826981 has 2 divisors, whose sum is σ = 289826982. Its totient is φ = 289826980.

The previous prime is 289826963. The next prime is 289827001. The reversal of 289826981 is 189628982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 233050756 + 56776225 = 15266^2 + 7535^2 .

It is a cyclic number.

It is not a de Polignac number, because 289826981 - 2⁶ = 289826917 is a prime.

It is a super-2 number, since 2×289826981² = 167999357831148722, 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 (289826951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144913490 + 144913491.

It is an arithmetic number, because the mean of its divisors is an integer number (144913491).

Almost surely, 2^289826981 is an apocalyptic number.

It is an amenable number.

289826981 is a deficient number, since it is larger than the sum of its proper divisors (1).

289826981 is an equidigital number, since it uses as much as digits as its factorization.

289826981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 995328, while the sum is 53.

The square root of 289826981 is about 17024.3055952365. The cubic root of 289826981 is about 661.7789328575.

The spelling of 289826981 in words is "two hundred eighty-nine million, eight hundred twenty-six thousand, nine hundred eighty-one".