288696991 has 16 divisors (see below), whose sum is σ = 320681088. Its totient is φ = 257709600.

The previous prime is 288696979. The next prime is 288697007. The reversal of 288696991 is 199696882.

It is a cyclic number.

It is not a de Polignac number, because 288696991 - 2¹⁷ = 288565919 is a prime.

It is a super-2 number, since 2×288696991² = 166691905224908162, 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 (288696901) 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, 164380 + ... + 166126.

It is an arithmetic number, because the mean of its divisors is an integer number (20042568).

Almost surely, 2^288696991 is an apocalyptic number.

288696991 is a deficient number, since it is larger than the sum of its proper divisors (31984097).

288696991 is a wasteful number, since it uses less digits than its factorization.

288696991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2022.

The product of its digits is 3359232, while the sum is 58.

The square root of 288696991 is about 16991.0856333549. The cubic root of 288696991 is about 660.9177552213.

The spelling of 288696991 in words is "two hundred eighty-eight million, six hundred ninety-six thousand, nine hundred ninety-one".