641250609 has 8 divisors (see below), whose sum is σ = 858735360. Its totient is φ = 425633136.

The previous prime is 641250583. The next prime is 641250641. The reversal of 641250609 is 906052146.

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

It is not a de Polignac number, because 641250609 - 2¹⁷ = 641119537 is a prime.

It is a super-2 number, since 2×641250609² = 822404687085741762, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 641250609.

It is not an unprimeable number, because it can be changed into a prime (641250689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 466017 + ... + 467390.

It is an arithmetic number, because the mean of its divisors is an integer number (107341920).

Almost surely, 2^641250609 is an apocalyptic number.

It is an amenable number.

641250609 is a deficient number, since it is larger than the sum of its proper divisors (217484751).

641250609 is a wasteful number, since it uses less digits than its factorization.

641250609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933639.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 641250609 is about 25322.9265488806. The cubic root of 641250609 is about 862.3348348302.

The spelling of 641250609 in words is "six hundred forty-one million, two hundred fifty thousand, six hundred nine".