67212081 has 6 divisors (see below), whose sum is σ = 97084130. Its totient is φ = 44808048.

The previous prime is 67212077. The next prime is 67212113. The reversal of 67212081 is 18021276.

It can be written as a sum of positive squares in only one way, i.e., 54997056 + 12215025 = 7416^2 + 3495^2 .

It is not a de Polignac number, because 67212081 - 2² = 67212077 is a prime.

It is a super-2 number, since 2×67212081² = 9034927664701122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (67212001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3733996 + ... + 3734013.

Almost surely, 2^67212081 is an apocalyptic number.

It is an amenable number.

67212081 is a deficient number, since it is larger than the sum of its proper divisors (29872049).

67212081 is a wasteful number, since it uses less digits than its factorization.

67212081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7468015 (or 7468012 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 67212081 is about 8198.2974452017. The cubic root of 67212081 is about 406.5829045288.

The spelling of 67212081 in words is "sixty-seven million, two hundred twelve thousand, eighty-one".