289013581 has 2 divisors, whose sum is σ = 289013582. Its totient is φ = 289013580.

The previous prime is 289013573. The next prime is 289013587. The reversal of 289013581 is 185310982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173343556 + 115670025 = 13166^2 + 10755^2 .

It is a cyclic number.

It is not a de Polignac number, because 289013581 - 2³ = 289013573 is a prime.

It is a super-2 number, since 2×289013581² = 167057700004887122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 289013581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (289013587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144506790 + 144506791.

It is an arithmetic number, because the mean of its divisors is an integer number (144506791).

Almost surely, 2^289013581 is an apocalyptic number.

It is an amenable number.

289013581 is a deficient number, since it is larger than the sum of its proper divisors (1).

289013581 is an equidigital number, since it uses as much as digits as its factorization.

289013581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 289013581 is about 17000.3994364838. The cubic root of 289013581 is about 661.1592581579.

It can be divided in two parts, 2890 and 13581, that added together give a triangular number (16471 = T₁₈₁).

The spelling of 289013581 in words is "two hundred eighty-nine million, thirteen thousand, five hundred eighty-one".