641630061 has 24 divisors (see below), whose sum is σ = 955374264. Its totient is φ = 414650880.

The previous prime is 641630051. The next prime is 641630081. The reversal of 641630061 is 160036146.

It can be written as a sum of positive squares in 4 ways, for example, as 79655625 + 561974436 = 8925^2 + 23706^2 .

It is not a de Polignac number, because 641630061 - 2⁵ = 641630029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641630051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 90145 + ... + 97001.

It is an arithmetic number, because the mean of its divisors is an integer number (39807261).

Almost surely, 2^641630061 is an apocalyptic number.

It is an amenable number.

641630061 is a deficient number, since it is larger than the sum of its proper divisors (313744203).

641630061 is a wasteful number, since it uses less digits than its factorization.

641630061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7181 (or 7178 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 641630061 is about 25330.4177028331. The cubic root of 641630061 is about 862.5048932300.

The spelling of 641630061 in words is "six hundred forty-one million, six hundred thirty thousand, sixty-one".