216251593 has 2 divisors, whose sum is σ = 216251594. Its totient is φ = 216251592.

The previous prime is 216251591. The next prime is 216251617. The reversal of 216251593 is 395152612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 172055689 + 44195904 = 13117^2 + 6648^2 .

It is a cyclic number.

It is not a de Polignac number, because 216251593 - 2¹ = 216251591 is a prime.

Together with 216251591, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (216251591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108125796 + 108125797.

It is an arithmetic number, because the mean of its divisors is an integer number (108125797).

Almost surely, 2^216251593 is an apocalyptic number.

It is an amenable number.

216251593 is a deficient number, since it is larger than the sum of its proper divisors (1).

216251593 is an equidigital number, since it uses as much as digits as its factorization.

216251593 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 34.

The square root of 216251593 is about 14705.4953333779. The cubic root of 216251593 is about 600.2328660921.

The spelling of 216251593 in words is "two hundred sixteen million, two hundred fifty-one thousand, five hundred ninety-three".