1200001641 has 8 divisors (see below), whose sum is σ = 1608043200. Its totient is φ = 795980592.

The previous prime is 1200001637. The next prime is 1200001651. The reversal of 1200001641 is 1461000021.

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

It is not a de Polignac number, because 1200001641 - 2² = 1200001637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1200001641.

It is not an unprimeable number, because it can be changed into a prime (1200001651) 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, 1004430 + ... + 1005623.

It is an arithmetic number, because the mean of its divisors is an integer number (201005400).

Almost surely, 2^1200001641 is an apocalyptic number.

It is an amenable number.

1200001641 is a deficient number, since it is larger than the sum of its proper divisors (408041559).

1200001641 is a wasteful number, since it uses less digits than its factorization.

1200001641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2010255.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1200001641 is about 34641.0398371642. The cubic root of 1200001641 is about 1062.6590535776.

Adding to 1200001641 its reverse (1461000021), we get a palindrome (2661001662).

The spelling of 1200001641 in words is "one billion, two hundred million, one thousand, six hundred forty-one".