641755121 has 16 divisors (see below), whose sum is σ = 755136000. Its totient is φ = 533874240.

The previous prime is 641755109. The next prime is 641755129. The reversal of 641755121 is 121557146.

It is a cyclic number.

It is not a de Polignac number, because 641755121 - 2⁶ = 641755057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (641755129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108755 + ... + 114503.

It is an arithmetic number, because the mean of its divisors is an integer number (47196000).

Almost surely, 2^641755121 is an apocalyptic number.

It is an amenable number.

641755121 is a deficient number, since it is larger than the sum of its proper divisors (113380879).

641755121 is a wasteful number, since it uses less digits than its factorization.

641755121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6224.

The product of its digits is 8400, while the sum is 32.

The square root of 641755121 is about 25332.8861561410. The cubic root of 641755121 is about 862.5609264809.

It can be divided in two parts, 64175 and 5121, that added together give a palindrome (69296).

The spelling of 641755121 in words is "six hundred forty-one million, seven hundred fifty-five thousand, one hundred twenty-one".