216431801 has 4 divisors (see below), whose sum is σ = 223413504. Its totient is φ = 209450100.

The previous prime is 216431791. The next prime is 216431821. The reversal of 216431801 is 108134612.

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 216431801 - 2¹⁰ = 216430777 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (216431821) 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 3 ways as a sum of consecutive naturals, for example, 3490805 + ... + 3490866.

It is an arithmetic number, because the mean of its divisors is an integer number (55853376).

Almost surely, 2^216431801 is an apocalyptic number.

It is an amenable number.

216431801 is a deficient number, since it is larger than the sum of its proper divisors (6981703).

216431801 is an equidigital number, since it uses as much as digits as its factorization.

216431801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6981702.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 216431801 is about 14711.6212906668. The cubic root of 216431801 is about 600.3995496152.

The spelling of 216431801 in words is "two hundred sixteen million, four hundred thirty-one thousand, eight hundred one".