641202985 has 8 divisors (see below), whose sum is σ = 770154120. Its totient is φ = 512488704.

The previous prime is 641202979. The next prime is 641202997. The reversal of 641202985 is 589202146.

It can be written as a sum of positive squares in 4 ways, for example, as 70375321 + 570827664 = 8389^2 + 23892^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 641202985 - 2⁵ = 641202953 is a prime.

It is a super-2 number, since 2×641202985² = 822282535945820450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53200 + ... + 64129.

It is an arithmetic number, because the mean of its divisors is an integer number (96269265).

Almost surely, 2^641202985 is an apocalyptic number.

It is an amenable number.

641202985 is a deficient number, since it is larger than the sum of its proper divisors (128951135).

641202985 is a wasteful number, since it uses less digits than its factorization.

641202985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118427.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 641202985 is about 25321.9861977689. The cubic root of 641202985 is about 862.3134865199.

The spelling of 641202985 in words is "six hundred forty-one million, two hundred two thousand, nine hundred eighty-five".