216757243 has 2 divisors, whose sum is σ = 216757244. Its totient is φ = 216757242.

The previous prime is 216757207. The next prime is 216757253. The reversal of 216757243 is 342757612.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216757243 - 2¹³ = 216749051 is a prime.

It is a super-2 number, since 2×216757243² = 93967404785922098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (216757253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108378621 + 108378622.

It is an arithmetic number, because the mean of its divisors is an integer number (108378622).

Almost surely, 2^216757243 is an apocalyptic number.

216757243 is a deficient number, since it is larger than the sum of its proper divisors (1).

216757243 is an equidigital number, since it uses as much as digits as its factorization.

216757243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 70560, while the sum is 37.

The square root of 216757243 is about 14722.6778474570. The cubic root of 216757243 is about 600.7003331636.

The spelling of 216757243 in words is "two hundred sixteen million, seven hundred fifty-seven thousand, two hundred forty-three".