213001309 has 4 divisors (see below), whose sum is σ = 213031260. Its totient is φ = 212971360.

The previous prime is 213001303. The next prime is 213001363. The reversal of 213001309 is 903100312.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 54316900 + 158684409 = 7370^2 + 12597^2 .

It is a cyclic number.

It is not a de Polignac number, because 213001309 - 2¹¹ = 212999261 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 (213001303) 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, 2457 + ... + 20785.

It is an arithmetic number, because the mean of its divisors is an integer number (53257815).

Almost surely, 2^213001309 is an apocalyptic number.

It is an amenable number.

213001309 is a deficient number, since it is larger than the sum of its proper divisors (29951).

213001309 is a wasteful number, since it uses less digits than its factorization.

213001309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29950.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 213001309 is about 14594.5643648586. The cubic root of 213001309 is about 597.2104853713.

The spelling of 213001309 in words is "two hundred thirteen million, one thousand, three hundred nine".