67521001 has 2 divisors, whose sum is σ = 67521002. Its totient is φ = 67521000.

The previous prime is 67520987. The next prime is 67521011. The reversal of 67521001 is 10012576.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66667225 + 853776 = 8165^2 + 924^2 .

It is a cyclic number.

It is not a de Polignac number, because 67521001 - 2⁵ = 67520969 is a prime.

It is not a weakly prime, because it can be changed into another prime (67521011) 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, 33760500 + 33760501.

It is an arithmetic number, because the mean of its divisors is an integer number (33760501).

Almost surely, 2^67521001 is an apocalyptic number.

It is an amenable number.

67521001 is a deficient number, since it is larger than the sum of its proper divisors (1).

67521001 is an equidigital number, since it uses as much as digits as its factorization.

67521001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 67521001 is about 8217.1163433409. The cubic root of 67521001 is about 407.2048643955.

Adding to 67521001 its reverse (10012576), we get a palindrome (77533577).

The spelling of 67521001 in words is "sixty-seven million, five hundred twenty-one thousand, one".