289279813 has 2 divisors, whose sum is σ = 289279814. Its totient is φ = 289279812.

The previous prime is 289279729. The next prime is 289279831. The reversal of 289279813 is 318972982.

Together with next prime (289279831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194937444 + 94342369 = 13962^2 + 9713^2 .

It is a cyclic number.

It is not a de Polignac number, because 289279813 - 2²¹ = 287182661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (289279853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144639906 + 144639907.

It is an arithmetic number, because the mean of its divisors is an integer number (144639907).

Almost surely, 2^289279813 is an apocalyptic number.

It is an amenable number.

289279813 is a deficient number, since it is larger than the sum of its proper divisors (1).

289279813 is an equidigital number, since it uses as much as digits as its factorization.

289279813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 49.

The square root of 289279813 is about 17008.2278030370. The cubic root of 289279813 is about 661.3622102472.

It can be divided in two parts, 289279 and 813, that added together give a palindrome (290092).

The spelling of 289279813 in words is "two hundred eighty-nine million, two hundred seventy-nine thousand, eight hundred thirteen".