212516545 has 4 divisors (see below), whose sum is σ = 255019860. Its totient is φ = 170013232.

The previous prime is 212516533. The next prime is 212516569. The reversal of 212516545 is 545615212.

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 48497296 + 164019249 = 6964^2 + 12807^2 .

It is a cyclic number.

It is not a de Polignac number, because 212516545 - 2⁷ = 212516417 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21251650 + ... + 21251659.

It is an arithmetic number, because the mean of its divisors is an integer number (63754965).

Almost surely, 2^212516545 is an apocalyptic number.

It is an amenable number.

212516545 is a deficient number, since it is larger than the sum of its proper divisors (42503315).

212516545 is an equidigital number, since it uses as much as digits as its factorization.

212516545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42503314.

The product of its digits is 12000, while the sum is 31.

The square root of 212516545 is about 14577.9472148859. The cubic root of 212516545 is about 596.7570827613.

The spelling of 212516545 in words is "two hundred twelve million, five hundred sixteen thousand, five hundred forty-five".