67121601 has 4 divisors (see below), whose sum is σ = 89495472. Its totient is φ = 44747732.

The previous prime is 67121597. The next prime is 67121609. The reversal of 67121601 is 10612176.

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 67121601 - 2² = 67121597 is a prime.

It is not an unprimeable number, because it can be changed into a prime (67121609) 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 in 3 ways as a sum of consecutive naturals, for example, 11186931 + ... + 11186936.

It is an arithmetic number, because the mean of its divisors is an integer number (22373868).

Almost surely, 2^67121601 is an apocalyptic number.

It is an amenable number.

67121601 is a deficient number, since it is larger than the sum of its proper divisors (22373871).

67121601 is a wasteful number, since it uses less digits than its factorization.

67121601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22373870.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 67121601 is about 8192.7773679016. Note that the first 3 decimals coincide. The cubic root of 67121601 is about 406.4003771186.

Adding to 67121601 its reverse (10612176), we get a palindrome (77733777).

The spelling of 67121601 in words is "sixty-seven million, one hundred twenty-one thousand, six hundred one".