216393701 has 4 divisors (see below), whose sum is σ = 216449100. Its totient is φ = 216338304.

The previous prime is 216393643. The next prime is 216393713. The reversal of 216393701 is 107393612.

It is a happy number.

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 130553476 + 85840225 = 11426^2 + 9265^2 .

It is a cyclic number.

It is not a de Polignac number, because 216393701 - 2²² = 212199397 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 (216393761) 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, 21356 + ... + 29813.

It is an arithmetic number, because the mean of its divisors is an integer number (54112275).

Almost surely, 2^216393701 is an apocalyptic number.

It is an amenable number.

216393701 is a deficient number, since it is larger than the sum of its proper divisors (55399).

216393701 is an equidigital number, since it uses as much as digits as its factorization.

216393701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55398.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 216393701 is about 14710.3263390042. The cubic root of 216393701 is about 600.3643167071.

The spelling of 216393701 in words is "two hundred sixteen million, three hundred ninety-three thousand, seven hundred one".