212307913 has 4 divisors (see below), whose sum is σ = 213408148. Its totient is φ = 211207680.

The previous prime is 212307889. The next prime is 212307971. The reversal of 212307913 is 319703212.

It is the 5949-th star 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 111767184 + 100540729 = 10572^2 + 10027^2 .

It is a cyclic number.

It is not a de Polignac number, because 212307913 - 2¹⁷ = 212176841 is a prime.

It is a Duffinian number.

212307913 is a modest number, since divided by 7913 gives 2123 as remainder.

It is not an unprimeable number, because it can be changed into a prime (212307113) 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, 549828 + ... + 550213.

It is an arithmetic number, because the mean of its divisors is an integer number (53352037).

Almost surely, 2^212307913 is an apocalyptic number.

It is an amenable number.

212307913 is a deficient number, since it is larger than the sum of its proper divisors (1100235).

212307913 is a wasteful number, since it uses less digits than its factorization.

212307913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1100234.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 212307913 is about 14570.7897177881. The cubic root of 212307913 is about 596.5617357932.

The spelling of 212307913 in words is "two hundred twelve million, three hundred seven thousand, nine hundred thirteen".