67051891 has 4 divisors (see below), whose sum is σ = 67134384. Its totient is φ = 66969400.

The previous prime is 67051883. The next prime is 67051909. The reversal of 67051891 is 19815076.

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

It is a cyclic number.

It is not a de Polignac number, because 67051891 - 2³ = 67051883 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 67051891.

It is not an unprimeable number, because it can be changed into a prime (67051801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40015 + ... + 41656.

It is an arithmetic number, because the mean of its divisors is an integer number (16783596).

Almost surely, 2^67051891 is an apocalyptic number.

67051891 is a deficient number, since it is larger than the sum of its proper divisors (82493).

67051891 is an equidigital number, since it uses as much as digits as its factorization.

67051891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82492.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 67051891 is about 8188.5219056921. The cubic root of 67051891 is about 406.2596376096.

The spelling of 67051891 in words is "sixty-seven million, fifty-one thousand, eight hundred ninety-one".