212265309 has 8 divisors (see below), whose sum is σ = 283343040. Its totient is φ = 141348896.

The previous prime is 212265307. The next prime is 212265341. The reversal of 212265309 is 903562212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212265309 - 2¹ = 212265307 is a prime.

It is a super-2 number, since 2×212265309² = 90113122809730962, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212265307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37224 + ... + 42545.

It is an arithmetic number, because the mean of its divisors is an integer number (35417880).

Almost surely, 2^212265309 is an apocalyptic number.

It is an amenable number.

212265309 is a deficient number, since it is larger than the sum of its proper divisors (71077731).

212265309 is an equidigital number, since it uses as much as digits as its factorization.

212265309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80659.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 212265309 is about 14569.3276783797. The cubic root of 212265309 is about 596.5218289489.

The spelling of 212265309 in words is "two hundred twelve million, two hundred sixty-five thousand, three hundred nine".