213776065 has 8 divisors (see below), whose sum is σ = 256674600. Its totient is φ = 170925312.

The previous prime is 213776063. The next prime is 213776107. The reversal of 213776065 is 560677312.

It can be written as a sum of positive squares in 4 ways, for example, as 18671041 + 195105024 = 4321^2 + 13968^2 .

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 213776065 - 2¹ = 213776063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213776063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1224 + ... + 20713.

It is an arithmetic number, because the mean of its divisors is an integer number (32084325).

Almost surely, 2^213776065 is an apocalyptic number.

It is an amenable number.

213776065 is a deficient number, since it is larger than the sum of its proper divisors (42898535).

213776065 is a wasteful number, since it uses less digits than its factorization.

213776065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23891.

The product of its (nonzero) digits is 52920, while the sum is 37.

The square root of 213776065 is about 14621.0828942319. The cubic root of 213776065 is about 597.9336930541.

The spelling of 213776065 in words is "two hundred thirteen million, seven hundred seventy-six thousand, sixty-five".