289231421 has 4 divisors (see below), whose sum is σ = 306245052. Its totient is φ = 272217792.

The previous prime is 289231409. The next prime is 289231427. The reversal of 289231421 is 124132982.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124132982 = 2 ⋅62066491.

It can be written as a sum of positive squares in 2 ways, for example, as 111302500 + 177928921 = 10550^2 + 13339^2 .

It is a cyclic number.

It is not a de Polignac number, because 289231421 - 2¹⁰ = 289230397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (289231427) 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, 8506790 + ... + 8506823.

It is an arithmetic number, because the mean of its divisors is an integer number (76561263).

Almost surely, 2^289231421 is an apocalyptic number.

It is an amenable number.

289231421 is a deficient number, since it is larger than the sum of its proper divisors (17013631).

289231421 is a wasteful number, since it uses less digits than its factorization.

289231421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17013630.

The product of its digits is 6912, while the sum is 32.

The square root of 289231421 is about 17006.8051379440. The cubic root of 289231421 is about 661.3253296638.

The spelling of 289231421 in words is "two hundred eighty-nine million, two hundred thirty-one thousand, four hundred twenty-one".