65212681 has 8 divisors (see below), whose sum is σ = 65853000. Its totient is φ = 64575360.

The previous prime is 65212649. The next prime is 65212687. The reversal of 65212681 is 18621256.

It can be written as a sum of positive squares in 4 ways, for example, as 7209225 + 58003456 = 2685^2 + 7616^2 .

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 65212681 - 2⁵ = 65212649 is a prime.

It is a super-2 number, since 2×65212681² = 8505387526415522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65212687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80205 + ... + 81013.

It is an arithmetic number, because the mean of its divisors is an integer number (8231625).

Almost surely, 2^65212681 is an apocalyptic number.

It is an amenable number.

65212681 is a deficient number, since it is larger than the sum of its proper divisors (640319).

65212681 is a wasteful number, since it uses less digits than its factorization.

65212681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1499.

The product of its digits is 5760, while the sum is 31.

The square root of 65212681 is about 8075.4368922059. The cubic root of 65212681 is about 402.5106276530.

The spelling of 65212681 in words is "sixty-five million, two hundred twelve thousand, six hundred eighty-one".