289129681 has 16 divisors (see below), whose sum is σ = 306225360. Its totient is φ = 272563200.

The previous prime is 289129657. The next prime is 289129697. The reversal of 289129681 is 186921982.

It can be written as a sum of positive squares in 8 ways, for example, as 435600 + 288694081 = 660^2 + 16991^2 .

It is a cyclic number.

It is not a de Polignac number, because 289129681 - 2⁵ = 289129649 is a prime.

It is a super-2 number, since 2×289129681² = 167191944870323522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (289126681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 480781 + ... + 481381.

It is an arithmetic number, because the mean of its divisors is an integer number (19139085).

Almost surely, 2^289129681 is an apocalyptic number.

It is an amenable number.

289129681 is a deficient number, since it is larger than the sum of its proper divisors (17095679).

289129681 is a wasteful number, since it uses less digits than its factorization.

289129681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 996.

The product of its digits is 124416, while the sum is 46.

The square root of 289129681 is about 17003.8137192807. The cubic root of 289129681 is about 661.2477780046.

The spelling of 289129681 in words is "two hundred eighty-nine million, one hundred twenty-nine thousand, six hundred eighty-one".