67931641 has 2 divisors, whose sum is σ = 67931642. Its totient is φ = 67931640.

The previous prime is 67931623. The next prime is 67931651. The reversal of 67931641 is 14613976.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66765241 + 1166400 = 8171^2 + 1080^2 .

It is a cyclic number.

It is not a de Polignac number, because 67931641 - 2¹¹ = 67929593 is a prime.

It is a super-2 number, since 2×67931641² = 9229415697905762, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 67931641.

It is not a weakly prime, because it can be changed into another prime (67931651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33965820 + 33965821.

It is an arithmetic number, because the mean of its divisors is an integer number (33965821).

Almost surely, 2^67931641 is an apocalyptic number.

It is an amenable number.

67931641 is a deficient number, since it is larger than the sum of its proper divisors (1).

67931641 is an equidigital number, since it uses as much as digits as its factorization.

67931641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 37.

The square root of 67931641 is about 8242.0653358245. The cubic root of 67931641 is about 408.0286908729.

The spelling of 67931641 in words is "sixty-seven million, nine hundred thirty-one thousand, six hundred forty-one".