216125993 has 4 divisors (see below), whose sum is σ = 216159060. Its totient is φ = 216092928.

The previous prime is 216125929. The next prime is 216126013. The reversal of 216125993 is 399521612.

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 144672784 + 71453209 = 12028^2 + 8453^2 .

It is a cyclic number.

It is not a de Polignac number, because 216125993 - 2⁶ = 216125929 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (216125093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3080 + ... + 21017.

It is an arithmetic number, because the mean of its divisors is an integer number (54039765).

Almost surely, 2^216125993 is an apocalyptic number.

It is an amenable number.

216125993 is a deficient number, since it is larger than the sum of its proper divisors (33067).

216125993 is an equidigital number, since it uses as much as digits as its factorization.

216125993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33066.

The product of its digits is 29160, while the sum is 38.

The square root of 216125993 is about 14701.2242007256. The cubic root of 216125993 is about 600.1166375099.

The spelling of 216125993 in words is "two hundred sixteen million, one hundred twenty-five thousand, nine hundred ninety-three".