216471001 has 2 divisors, whose sum is σ = 216471002. Its totient is φ = 216471000.

The previous prime is 216470983. The next prime is 216471023. The reversal of 216471001 is 100174612.

It is an a-pointer prime, because the next prime (216471023) can be obtained adding 216471001 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210221001 + 6250000 = 14499^2 + 2500^2 .

It is a cyclic number.

It is not a de Polignac number, because 216471001 - 2¹¹ = 216468953 is a prime.

It is not a weakly prime, because it can be changed into another prime (216471041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108235500 + 108235501.

It is an arithmetic number, because the mean of its divisors is an integer number (108235501).

Almost surely, 2^216471001 is an apocalyptic number.

It is an amenable number.

216471001 is a deficient number, since it is larger than the sum of its proper divisors (1).

216471001 is an equidigital number, since it uses as much as digits as its factorization.

216471001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 216471001 is about 14712.9535104275. The cubic root of 216471001 is about 600.4357954310.

The spelling of 216471001 in words is "two hundred sixteen million, four hundred seventy-one thousand, one".