65212009 has 8 divisors (see below), whose sum is σ = 69612480. Its totient is φ = 60908400.

The previous prime is 65212001. The next prime is 65212013. The reversal of 65212009 is 90021256.

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 65212009 - 2³ = 65212001 is a prime.

It is a super-2 number, since 2×65212009² = 8505212235632162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65212001) 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, 22822 + ... + 25519.

It is an arithmetic number, because the mean of its divisors is an integer number (8701560).

Almost surely, 2^65212009 is an apocalyptic number.

It is an amenable number.

65212009 is a deficient number, since it is larger than the sum of its proper divisors (4400471).

65212009 is a wasteful number, since it uses less digits than its factorization.

65212009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48431.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 65212009 is about 8075.3952844427. The cubic root of 65212009 is about 402.5092450585.

The spelling of 65212009 in words is "sixty-five million, two hundred twelve thousand, nine".