67021481 has 2 divisors, whose sum is σ = 67021482. Its totient is φ = 67021480.

The previous prime is 67021469. The next prime is 67021489. The reversal of 67021481 is 18412076.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50537881 + 16483600 = 7109^2 + 4060^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67021481 is a prime.

It is a super-2 number, since 2×67021481² = 8983757830866722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a nialpdrome in base 4.

It is not a weakly prime, because it can be changed into another prime (67021489) 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 as a sum of consecutive naturals, namely, 33510740 + 33510741.

It is an arithmetic number, because the mean of its divisors is an integer number (33510741).

Almost surely, 2^67021481 is an apocalyptic number.

It is an amenable number.

67021481 is a deficient number, since it is larger than the sum of its proper divisors (1).

67021481 is an equidigital number, since it uses as much as digits as its factorization.

67021481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 67021481 is about 8186.6648276328. The cubic root of 67021481 is about 406.1982114338.

The spelling of 67021481 in words is "sixty-seven million, twenty-one thousand, four hundred eighty-one".