289031881 has 2 divisors, whose sum is σ = 289031882. Its totient is φ = 289031880.

The previous prime is 289031867. The next prime is 289031887. The reversal of 289031881 is 188130982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 265168656 + 23863225 = 16284^2 + 4885^2 .

It is a cyclic number.

It is not a de Polignac number, because 289031881 - 2²⁵ = 255477449 is a prime.

It is a super-2 number, since 2×289031881² = 167078856468796322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (289031887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144515940 + 144515941.

It is an arithmetic number, because the mean of its divisors is an integer number (144515941).

Almost surely, 2^289031881 is an apocalyptic number.

It is an amenable number.

289031881 is a deficient number, since it is larger than the sum of its proper divisors (1).

289031881 is an equidigital number, since it uses as much as digits as its factorization.

289031881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 40.

The square root of 289031881 is about 17000.9376506121. The cubic root of 289031881 is about 661.1732124722.

The spelling of 289031881 in words is "two hundred eighty-nine million, thirty-one thousand, eight hundred eighty-one".