212563261 has 6 divisors (see below), whose sum is σ = 218464890. Its totient is φ = 206816976.

The previous prime is 212563259. The next prime is 212563277. The reversal of 212563261 is 162365212.

It can be written as a sum of positive squares in 3 ways, for example, as 46308025 + 166255236 = 6805^2 + 12894^2 .

It is not a de Polignac number, because 212563261 - 2¹ = 212563259 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 (212563661) 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 5 ways as a sum of consecutive naturals, for example, 76266 + ... + 79003.

It is an arithmetic number, because the mean of its divisors is an integer number (36410815).

Almost surely, 2^212563261 is an apocalyptic number.

It is an amenable number.

212563261 is a deficient number, since it is larger than the sum of its proper divisors (5901629).

212563261 is an equidigital number, since it uses as much as digits as its factorization.

212563261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155343 (or 155306 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The square root of 212563261 is about 14579.5494100469. The cubic root of 212563261 is about 596.8008065121.

The spelling of 212563261 in words is "two hundred twelve million, five hundred sixty-three thousand, two hundred sixty-one".