67752121 has 2 divisors, whose sum is σ = 67752122. Its totient is φ = 67752120.

The previous prime is 67752109. The next prime is 67752161. The reversal of 67752121 is 12125776.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51840000 + 15912121 = 7200^2 + 3989^2 .

It is a cyclic number.

It is not a de Polignac number, because 67752121 - 2⁹ = 67751609 is a prime.

It is not a weakly prime, because it can be changed into another prime (67752161) 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 as a sum of consecutive naturals, namely, 33876060 + 33876061.

It is an arithmetic number, because the mean of its divisors is an integer number (33876061).

Almost surely, 2^67752121 is an apocalyptic number.

It is an amenable number.

67752121 is a deficient number, since it is larger than the sum of its proper divisors (1).

67752121 is an equidigital number, since it uses as much as digits as its factorization.

67752121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5880, while the sum is 31.

The square root of 67752121 is about 8231.1676571432. The cubic root of 67752121 is about 407.6689472215.

Adding to 67752121 its reverse (12125776), we get a palindrome (79877897).

The spelling of 67752121 in words is "sixty-seven million, seven hundred fifty-two thousand, one hundred twenty-one".