67312261 has 4 divisors (see below), whose sum is σ = 67480524. Its totient is φ = 67144000.

The previous prime is 67312247. The next prime is 67312303. The reversal of 67312261 is 16221376.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 65044225 + 2268036 = 8065^2 + 1506^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67312261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67312211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83530 + ... + 84331.

It is an arithmetic number, because the mean of its divisors is an integer number (16870131).

Almost surely, 2^67312261 is an apocalyptic number.

It is an amenable number.

67312261 is a deficient number, since it is larger than the sum of its proper divisors (168263).

67312261 is a wasteful number, since it uses less digits than its factorization.

67312261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168262.

The product of its digits is 3024, while the sum is 28.

The square root of 67312261 is about 8204.4049753776. The cubic root of 67312261 is about 406.7848089815.

The spelling of 67312261 in words is "sixty-seven million, three hundred twelve thousand, two hundred sixty-one".