216360493 has 4 divisors (see below), whose sum is σ = 220027680. Its totient is φ = 212693308.

The previous prime is 216360491. The next prime is 216360509. The reversal of 216360493 is 394063612.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216360493 - 2¹ = 216360491 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216360491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1833505 + ... + 1833622.

It is an arithmetic number, because the mean of its divisors is an integer number (55006920).

Almost surely, 2^216360493 is an apocalyptic number.

It is an amenable number.

216360493 is a deficient number, since it is larger than the sum of its proper divisors (3667187).

216360493 is an equidigital number, since it uses as much as digits as its factorization.

216360493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3667186.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 216360493 is about 14709.1975647892. The cubic root of 216360493 is about 600.3336042941. Note that the first 3 decimals are identical.

The spelling of 216360493 in words is "two hundred sixteen million, three hundred sixty thousand, four hundred ninety-three".