641201161 has 4 divisors (see below), whose sum is σ = 642769300. Its totient is φ = 639633024.

The previous prime is 641201159. The next prime is 641201177. The reversal of 641201161 is 161102146.

641201161 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.

It can be written as a sum of positive squares in 2 ways, for example, as 624750025 + 16451136 = 24995^2 + 4056^2 .

It is a cyclic number.

It is not a de Polignac number, because 641201161 - 2¹ = 641201159 is a prime.

It is a super-2 number, since 2×641201161² = 822277857735495842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641201131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 783456 + ... + 784273.

It is an arithmetic number, because the mean of its divisors is an integer number (160692325).

Almost surely, 2^641201161 is an apocalyptic number.

It is an amenable number.

641201161 is a deficient number, since it is larger than the sum of its proper divisors (1568139).

641201161 is a wasteful number, since it uses less digits than its factorization.

641201161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1568138.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 641201161 is about 25321.9501816112. The cubic root of 641201161 is about 862.3126688583.

The spelling of 641201161 in words is "six hundred forty-one million, two hundred one thousand, one hundred sixty-one".