289964861 has 4 divisors (see below), whose sum is σ = 290019324. Its totient is φ = 289910400.

The previous prime is 289964797. The next prime is 289964863. The reversal of 289964861 is 168469982.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 168469982 = 2 ⋅84234991.

It can be written as a sum of positive squares in 2 ways, for example, as 157000900 + 132963961 = 12530^2 + 11531^2 .

It is a cyclic number.

It is not a de Polignac number, because 289964861 - 2⁶ = 289964797 is a prime.

It is a super-2 number, since 2×289964861² = 168159241229498642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (289964863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18260 + ... + 30221.

It is an arithmetic number, because the mean of its divisors is an integer number (72504831).

Almost surely, 2^289964861 is an apocalyptic number.

It is an amenable number.

289964861 is a deficient number, since it is larger than the sum of its proper divisors (54463).

289964861 is an equidigital number, since it uses as much as digits as its factorization.

289964861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54462.

The product of its digits is 1492992, while the sum is 53.

The square root of 289964861 is about 17028.3546181068. The cubic root of 289964861 is about 661.8838593821.

The spelling of 289964861 in words is "two hundred eighty-nine million, nine hundred sixty-four thousand, eight hundred sixty-one".