67209481 has 2 divisors, whose sum is σ = 67209482. Its totient is φ = 67209480.

The previous prime is 67209469. The next prime is 67209533. The reversal of 67209481 is 18490276.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51337225 + 15872256 = 7165^2 + 3984^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67209481 is a prime.

It is a super-2 number, since 2×67209481² = 9034228672578722, 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 67209481.

It is not a weakly prime, because it can be changed into another prime (67209451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33604740 + 33604741.

It is an arithmetic number, because the mean of its divisors is an integer number (33604741).

Almost surely, 2^67209481 is an apocalyptic number.

It is an amenable number.

67209481 is a deficient number, since it is larger than the sum of its proper divisors (1).

67209481 is an equidigital number, since it uses as much as digits as its factorization.

67209481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 67209481 is about 8198.1388741592. The cubic root of 67209481 is about 406.5776617750.

The spelling of 67209481 in words is "sixty-seven million, two hundred nine thousand, four hundred eighty-one".