65121601 has 4 divisors (see below), whose sum is σ = 65145600. Its totient is φ = 65097604.

The previous prime is 65121599. The next prime is 65121631. The reversal of 65121601 is 10612156.

65121601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 65121601 - 2¹ = 65121599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65121631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7321 + ... + 13558.

It is an arithmetic number, because the mean of its divisors is an integer number (16286400).

Almost surely, 2^65121601 is an apocalyptic number.

It is an amenable number.

65121601 is a deficient number, since it is larger than the sum of its proper divisors (23999).

65121601 is a wasteful number, since it uses less digits than its factorization.

65121601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23998.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 65121601 is about 8069.7955984027. The cubic root of 65121601 is about 402.3231500634.

Adding to 65121601 its reverse (10612156), we get a palindrome (75733757).

The spelling of 65121601 in words is "sixty-five million, one hundred twenty-one thousand, six hundred one".