289923631 has 4 divisors (see below), whose sum is σ = 292794264. Its totient is φ = 287053000.

The previous prime is 289923619. The next prime is 289923637. The reversal of 289923631 is 136329982.

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-289923631 is a prime.

It is a super-2 number, since 2×289923631² = 168111423624448322, 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 (289923637) 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, 1435165 + ... + 1435366.

It is an arithmetic number, because the mean of its divisors is an integer number (73198566).

Almost surely, 2^289923631 is an apocalyptic number.

289923631 is a deficient number, since it is larger than the sum of its proper divisors (2870633).

289923631 is a wasteful number, since it uses less digits than its factorization.

289923631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2870632.

The product of its digits is 139968, while the sum is 43.

The square root of 289923631 is about 17027.1439472391. The cubic root of 289923631 is about 661.8524868852.

It can be divided in two parts, 28992 and 3631, that added together give a palindrome (32623).

The spelling of 289923631 in words is "two hundred eighty-nine million, nine hundred twenty-three thousand, six hundred thirty-one".