216431001 has 16 divisors (see below), whose sum is σ = 324244800. Its totient is φ = 142664544.

The previous prime is 216430999. The next prime is 216431003. The reversal of 216431001 is 100134612.

It is a happy number.

216431001 is a `hidden beast` number, since 21 + 643 + 1 + 0 + 0 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (216430999) and next prime (216431003).

It is not a de Polignac number, because 216431001 - 2¹ = 216430999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216431003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42631 + ... + 47436.

It is an arithmetic number, because the mean of its divisors is an integer number (20265300).

Almost surely, 2^216431001 is an apocalyptic number.

It is an amenable number.

216431001 is a deficient number, since it is larger than the sum of its proper divisors (107813799).

216431001 is an equidigital number, since it uses as much as digits as its factorization.

216431001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90165 (or 90159 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 216431001 is about 14711.5941012523. The cubic root of 216431001 is about 600.3988098591.

Adding to 216431001 its reverse (100134612), we get a palindrome (316565613).

The spelling of 216431001 in words is "two hundred sixteen million, four hundred thirty-one thousand, one".