641452985 has 4 divisors (see below), whose sum is σ = 769743588. Its totient is φ = 513162384.

The previous prime is 641452963. The next prime is 641453009. The reversal of 641452985 is 589254146.

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 508096681 + 133356304 = 22541^2 + 11548^2 .

It is a cyclic number.

It is not a de Polignac number, because 641452985 - 2²⁰ = 640404409 is a prime.

It is a super-2 number, since 2×641452985² = 822923863930820450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64145294 + ... + 64145303.

It is an arithmetic number, because the mean of its divisors is an integer number (192435897).

Almost surely, 2^641452985 is an apocalyptic number.

It is an amenable number.

641452985 is a deficient number, since it is larger than the sum of its proper divisors (128290603).

641452985 is a wasteful number, since it uses less digits than its factorization.

641452985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128290602.

The product of its digits is 345600, while the sum is 44.

The square root of 641452985 is about 25326.9221383097. The cubic root of 641452985 is about 862.4255417065.

The spelling of 641452985 in words is "six hundred forty-one million, four hundred fifty-two thousand, nine hundred eighty-five".