67061971 has 4 divisors (see below), whose sum is σ = 67146912. Its totient is φ = 66977032.

The previous prime is 67061947. The next prime is 67061987. The reversal of 67061971 is 17916076.

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 67061971 - 2¹⁹ = 66537683 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 67061971.

It is not an unprimeable number, because it can be changed into a prime (67061671) 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, 41275 + ... + 42868.

It is an arithmetic number, because the mean of its divisors is an integer number (16786728).

Almost surely, 2^67061971 is an apocalyptic number.

67061971 is a deficient number, since it is larger than the sum of its proper divisors (84941).

67061971 is an equidigital number, since it uses as much as digits as its factorization.

67061971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84940.

The product of its (nonzero) digits is 15876, while the sum is 37.

The square root of 67061971 is about 8189.1373782591. The cubic root of 67061971 is about 406.2799944402.

The spelling of 67061971 in words is "sixty-seven million, sixty-one thousand, nine hundred seventy-one".