213663305 has 8 divisors (see below), whose sum is σ = 256489800. Its totient is φ = 170868096.

The previous prime is 213663287. The next prime is 213663319. The reversal of 213663305 is 503366312.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 40398736 + 173264569 = 6356^2 + 13163^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213663305 - 2¹⁴ = 213646921 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11591 + ... + 23699.

It is an arithmetic number, because the mean of its divisors is an integer number (32061225).

Almost surely, 2^213663305 is an apocalyptic number.

It is an amenable number.

213663305 is a deficient number, since it is larger than the sum of its proper divisors (42826495).

213663305 is a wasteful number, since it uses less digits than its factorization.

213663305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15643.

The product of its (nonzero) digits is 9720, while the sum is 29.

The square root of 213663305 is about 14617.2263100768. The cubic root of 213663305 is about 597.8285442992.

The spelling of 213663305 in words is "two hundred thirteen million, six hundred sixty-three thousand, three hundred five".