289340881 has 2 divisors, whose sum is σ = 289340882. Its totient is φ = 289340880.

The previous prime is 289340819. The next prime is 289340903. The reversal of 289340881 is 188043982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 207619281 + 81721600 = 14409^2 + 9040^2 .

It is a cyclic number.

It is not a de Polignac number, because 289340881 - 2¹⁵ = 289308113 is a prime.

It is a super-2 number, since 2×289340881² = 167436290835712322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (289340281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144670440 + 144670441.

It is an arithmetic number, because the mean of its divisors is an integer number (144670441).

Almost surely, 2^289340881 is an apocalyptic number.

It is an amenable number.

289340881 is a deficient number, since it is larger than the sum of its proper divisors (1).

289340881 is an equidigital number, since it uses as much as digits as its factorization.

289340881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 110592, while the sum is 43.

The square root of 289340881 is about 17010.0229570686. The cubic root of 289340881 is about 661.4087456130.

The spelling of 289340881 in words is "two hundred eighty-nine million, three hundred forty thousand, eight hundred eighty-one".