212780569 has 9 divisors (see below), whose sum is σ = 220809823. Its totient is φ = 205034872.

The previous prime is 212780507. The next prime is 212780573. The reversal of 212780569 is 965087212.

The square root of 212780569 is 14587.

It is a perfect power (a square), and thus also a powerful number.

212780569 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 111576969 + 101203600 = 10563^2 + 10060^2 .

It is not a de Polignac number, because 212780569 - 2⁷ = 212780441 is a prime.

It is a super-2 number, since 2×212780569² = 90551141087927522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212780369) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 422772 + ... + 423274.

Almost surely, 2^212780569 is an apocalyptic number.

212780569 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

212780569 is the 14587-th square number.

212780569 is the 7294-th centered octagonal number.

It is an amenable number.

212780569 is a deficient number, since it is larger than the sum of its proper divisors (8029254).

212780569 is an frugal number, since it uses more digits than its factorization.

212780569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064 (or 532 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 40.

The cubic root of 212780569 is about 597.0041113531.

The spelling of 212780569 in words is "two hundred twelve million, seven hundred eighty thousand, five hundred sixty-nine".