289289491 has 4 divisors (see below), whose sum is σ = 289418272. Its totient is φ = 289160712.

The previous prime is 289289479. The next prime is 289289521. The reversal of 289289491 is 194982982.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-289289491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (289289461) 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, 60960 + ... + 65533.

It is an arithmetic number, because the mean of its divisors is an integer number (72354568).

Almost surely, 2^289289491 is an apocalyptic number.

289289491 is a deficient number, since it is larger than the sum of its proper divisors (128781).

289289491 is a wasteful number, since it uses less digits than its factorization.

289289491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128780.

The product of its digits is 746496, while the sum is 52.

The square root of 289289491 is about 17008.5123100170. The cubic root of 289289491 is about 661.3695855655.

The spelling of 289289491 in words is "two hundred eighty-nine million, two hundred eighty-nine thousand, four hundred ninety-one".