216749101 has 4 divisors (see below), whose sum is σ = 221360832. Its totient is φ = 212137372.

The previous prime is 216749081. The next prime is 216749123. The reversal of 216749101 is 101947612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216749101 - 2²⁷ = 82531373 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 (216740101) 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, 2305795 + ... + 2305888.

It is an arithmetic number, because the mean of its divisors is an integer number (55340208).

Almost surely, 2^216749101 is an apocalyptic number.

It is an amenable number.

216749101 is a deficient number, since it is larger than the sum of its proper divisors (4611731).

216749101 is an equidigital number, since it uses as much as digits as its factorization.

216749101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4611730.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 216749101 is about 14722.4013326631. The cubic root of 216749101 is about 600.6928117489.

The spelling of 216749101 in words is "two hundred sixteen million, seven hundred forty-nine thousand, one hundred one".