216537001 has 2 divisors, whose sum is σ = 216537002. Its totient is φ = 216537000.

The previous prime is 216536993. The next prime is 216537011. The reversal of 216537001 is 100735612.

216537001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 216531225 + 5776 = 14715^2 + 76^2 .

It is a cyclic number.

It is not a de Polignac number, because 216537001 - 2³ = 216536993 is a prime.

It is not a weakly prime, because it can be changed into another prime (216537011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108268500 + 108268501.

It is an arithmetic number, because the mean of its divisors is an integer number (108268501).

Almost surely, 2^216537001 is an apocalyptic number.

It is an amenable number.

216537001 is a deficient number, since it is larger than the sum of its proper divisors (1).

216537001 is an equidigital number, since it uses as much as digits as its factorization.

216537001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 216537001 is about 14715.1962610085. The cubic root of 216537001 is about 600.4968116649.

The spelling of 216537001 in words is "two hundred sixteen million, five hundred thirty-seven thousand, one".