216503401 has 4 divisors (see below), whose sum is σ = 216567252. Its totient is φ = 216439552.

The previous prime is 216503387. The next prime is 216503437. The reversal of 216503401 is 104305612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 123187801 + 93315600 = 11099^2 + 9660^2 .

It is a cyclic number.

It is not a de Polignac number, because 216503401 - 2⁵ = 216503369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216501401) 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, 26536 + ... + 33721.

It is an arithmetic number, because the mean of its divisors is an integer number (54141813).

Almost surely, 2^216503401 is an apocalyptic number.

It is an amenable number.

216503401 is a deficient number, since it is larger than the sum of its proper divisors (63851).

216503401 is an equidigital number, since it uses as much as digits as its factorization.

216503401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63850.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 216503401 is about 14714.0545397929. The cubic root of 216503401 is about 600.4657504044.

The spelling of 216503401 in words is "two hundred sixteen million, five hundred three thousand, four hundred one".