67506121 has 4 divisors (see below), whose sum is σ = 67640832. Its totient is φ = 67371412.

The previous prime is 67506119. The next prime is 67506139. The reversal of 67506121 is 12160576.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 67506121 - 2¹ = 67506119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 67506121.

It is not an unprimeable number, because it can be changed into a prime (67506151) 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 in 3 ways as a sum of consecutive naturals, for example, 66601 + ... + 67606.

It is an arithmetic number, because the mean of its divisors is an integer number (16910208).

Almost surely, 2^67506121 is an apocalyptic number.

It is an amenable number.

67506121 is a deficient number, since it is larger than the sum of its proper divisors (134711).

67506121 is a wasteful number, since it uses less digits than its factorization.

67506121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134710.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 67506121 is about 8216.2108663301. The cubic root of 67506121 is about 407.1749494878.

Adding to 67506121 its reverse (12160576), we get a palindrome (79666697).

The spelling of 67506121 in words is "sixty-seven million, five hundred six thousand, one hundred twenty-one".