216561103 has 8 divisors (see below), whose sum is σ = 236355840. Its totient is φ = 196784280.

The previous prime is 216561097. The next prime is 216561109. The reversal of 216561103 is 301165612.

It is an interprime number because it is at equal distance from previous prime (216561097) and next prime (216561109).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-216561103 is a prime.

It is a super-2 number, since 2×216561103² = 93797422665153218, 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 (216561109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40458 + ... + 45496.

It is an arithmetic number, because the mean of its divisors is an integer number (29544480).

Almost surely, 2^216561103 is an apocalyptic number.

216561103 is a deficient number, since it is larger than the sum of its proper divisors (19794737).

216561103 is a wasteful number, since it uses less digits than its factorization.

216561103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8957.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 216561103 is about 14716.0151875431. The cubic root of 216561103 is about 600.5190905936.

The spelling of 216561103 in words is "two hundred sixteen million, five hundred sixty-one thousand, one hundred three".