216233949 has 4 divisors (see below), whose sum is σ = 288311936. Its totient is φ = 144155964.

The previous prime is 216233933. The next prime is 216233987. The reversal of 216233949 is 949332612.

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 not a de Polignac number, because 216233949 - 2⁴ = 216233933 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 (216233909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36038989 + ... + 36038994.

It is an arithmetic number, because the mean of its divisors is an integer number (72077984).

Almost surely, 2^216233949 is an apocalyptic number.

It is an amenable number.

216233949 is a deficient number, since it is larger than the sum of its proper divisors (72077987).

216233949 is an equidigital number, since it uses as much as digits as its factorization.

216233949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72077986.

The product of its digits is 69984, while the sum is 39.

The square root of 216233949 is about 14704.8954093526. The cubic root of 216233949 is about 600.2165412848.

The spelling of 216233949 in words is "two hundred sixteen million, two hundred thirty-three thousand, nine hundred forty-nine".