216064949 has 4 divisors (see below), whose sum is σ = 217258860. Its totient is φ = 214871040.

The previous prime is 216064943. The next prime is 216064991. The reversal of 216064949 is 949460612.

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 61858225 + 154206724 = 7865^2 + 12418^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216064949 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 (216064943) 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, 596684 + ... + 597045.

It is an arithmetic number, because the mean of its divisors is an integer number (54314715).

Almost surely, 2^216064949 is an apocalyptic number.

It is an amenable number.

216064949 is a deficient number, since it is larger than the sum of its proper divisors (1193911).

216064949 is a wasteful number, since it uses less digits than its factorization.

216064949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1193910.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 216064949 is about 14699.1479004737. The cubic root of 216064949 is about 600.0601319363.

The spelling of 216064949 in words is "two hundred sixteen million, sixty-four thousand, nine hundred forty-nine".