1641641817 has 8 divisors (see below), whose sum is σ = 2193843520. Its totient is φ = 1091934000.

The previous prime is 1641641777. The next prime is 1641641861. The reversal of 1641641817 is 7181461461.

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

It is not a de Polignac number, because 1641641817 - 2¹² = 1641637721 is a prime.

It is a super-2 number, since 2×1641641817² = 5389975710646122978, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1641641867) 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, 621934 + ... + 624567.

It is an arithmetic number, because the mean of its divisors is an integer number (274230440).

Almost surely, 2^1641641817 is an apocalyptic number.

It is an amenable number.

1641641817 is a deficient number, since it is larger than the sum of its proper divisors (552201703).

1641641817 is a wasteful number, since it uses less digits than its factorization.

1641641817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1246943.

The product of its digits is 32256, while the sum is 39.

The square root of 1641641817 is about 40517.1792823735. The cubic root of 1641641817 is about 1179.6671034985.

The spelling of 1641641817 in words is "one billion, six hundred forty-one million, six hundred forty-one thousand, eight hundred seventeen".