216161401 has 8 divisors (see below), whose sum is σ = 220465800. Its totient is φ = 211865472.

The previous prime is 216161377. The next prime is 216161411. The reversal of 216161401 is 104161612.

It can be written as a sum of positive squares in 4 ways, for example, as 12243001 + 203918400 = 3499^2 + 14280^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 216161401 - 2¹³ = 216153209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216161411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80781 + ... + 83413.

It is an arithmetic number, because the mean of its divisors is an integer number (27558225).

Almost surely, 2^216161401 is an apocalyptic number.

It is an amenable number.

216161401 is a deficient number, since it is larger than the sum of its proper divisors (4304399).

216161401 is a wasteful number, since it uses less digits than its factorization.

216161401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4235.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 216161401 is about 14702.4284048588. The cubic root of 216161401 is about 600.1494081626.

The spelling of 216161401 in words is "two hundred sixteen million, one hundred sixty-one thousand, four hundred one".