216937601 has 4 divisors (see below), whose sum is σ = 222228804. Its totient is φ = 211646400.

The previous prime is 216937583. The next prime is 216937607. The reversal of 216937601 is 106739612.

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 80982001 + 135955600 = 8999^2 + 11660^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216937601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216937607) 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, 2645540 + ... + 2645621.

It is an arithmetic number, because the mean of its divisors is an integer number (55557201).

Almost surely, 2^216937601 is an apocalyptic number.

It is an amenable number.

216937601 is a deficient number, since it is larger than the sum of its proper divisors (5291203).

216937601 is an equidigital number, since it uses as much as digits as its factorization.

216937601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5291202.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 216937601 is about 14728.8017503122. The cubic root of 216937601 is about 600.8668959565.

The spelling of 216937601 in words is "two hundred sixteen million, nine hundred thirty-seven thousand, six hundred one".