289733981 has 2 divisors, whose sum is σ = 289733982. Its totient is φ = 289733980.

The previous prime is 289733933. The next prime is 289734023. The reversal of 289733981 is 189337982.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209989081 + 79744900 = 14491^2 + 8930^2 .

It is a cyclic number.

It is not a de Polignac number, because 289733981 - 2²² = 285539677 is a prime.

It is a super-2 number, since 2×289733981² = 167891559492216722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (289733281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144866990 + 144866991.

It is an arithmetic number, because the mean of its divisors is an integer number (144866991).

Almost surely, 2^289733981 is an apocalyptic number.

It is an amenable number.

289733981 is a deficient number, since it is larger than the sum of its proper divisors (1).

289733981 is an equidigital number, since it uses as much as digits as its factorization.

289733981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 50.

The square root of 289733981 is about 17021.5739871494. The cubic root of 289733981 is about 661.7081411681.

The spelling of 289733981 in words is "two hundred eighty-nine million, seven hundred thirty-three thousand, nine hundred eighty-one".