289620991 has 16 divisors (see below), whose sum is σ = 335923200. Its totient is φ = 247081120.

The previous prime is 289620979. The next prime is 289620997. The reversal of 289620991 is 199026982.

It is not a de Polignac number, because 289620991 - 2¹⁵ = 289588223 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 (289620997) 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, 2610 + ... + 24208.

It is an arithmetic number, because the mean of its divisors is an integer number (20995200).

Almost surely, 2^289620991 is an apocalyptic number.

289620991 is a deficient number, since it is larger than the sum of its proper divisors (46302209).

289620991 is a wasteful number, since it uses less digits than its factorization.

289620991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21686.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 289620991 is about 17018.2546402385. The cubic root of 289620991 is about 661.6221126857.

The spelling of 289620991 in words is "two hundred eighty-nine million, six hundred twenty thousand, nine hundred ninety-one".