67971913 has 4 divisors (see below), whose sum is σ = 68028100. Its totient is φ = 67915728.

The previous prime is 67971901. The next prime is 67971919. The reversal of 67971913 is 31917976.

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 36578304 + 31393609 = 6048^2 + 5603^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67971913 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 67971913.

It is not an unprimeable number, because it can be changed into a prime (67971919) 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 3 ways as a sum of consecutive naturals, for example, 26238 + ... + 28711.

It is an arithmetic number, because the mean of its divisors is an integer number (17007025).

Almost surely, 2^67971913 is an apocalyptic number.

It is an amenable number.

67971913 is a deficient number, since it is larger than the sum of its proper divisors (56187).

67971913 is a wasteful number, since it uses less digits than its factorization.

67971913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56186.

The product of its digits is 71442, while the sum is 43.

The square root of 67971913 is about 8244.5080508178. The cubic root of 67971913 is about 408.1093056650.

The spelling of 67971913 in words is "sixty-seven million, nine hundred seventy-one thousand, nine hundred thirteen".