217054989 has 12 divisors (see below), whose sum is σ = 314277600. Its totient is φ = 144355464.

The previous prime is 217054973. The next prime is 217055021. The reversal of 217054989 is 989450712.

217054989 is a `hidden beast` number, since 21 + 7 + 0 + 549 + 89 = 666.

It is not a de Polignac number, because 217054989 - 2⁴ = 217054973 is a prime.

It is a super-2 number, since 2×217054989² = 94225736499580242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217054939) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25009 + ... + 32550.

It is an arithmetic number, because the mean of its divisors is an integer number (26189800).

Almost surely, 2^217054989 is an apocalyptic number.

It is an amenable number.

217054989 is a deficient number, since it is larger than the sum of its proper divisors (97222611).

217054989 is a wasteful number, since it uses less digits than its factorization.

217054989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57984 (or 57981 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 217054989 is about 14732.7861927064. The cubic root of 217054989 is about 600.9752556020.

The spelling of 217054989 in words is "two hundred seventeen million, fifty-four thousand, nine hundred eighty-nine".