1871000641 has 4 divisors (see below), whose sum is σ = 1871153284. Its totient is φ = 1870848000.

The previous prime is 1871000633. The next prime is 1871000653. The reversal of 1871000641 is 1460001781.

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 364008241 + 1506992400 = 19079^2 + 38820^2 .

It is a cyclic number.

It is not a de Polignac number, because 1871000641 - 2³ = 1871000633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1871000611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56160 + ... + 83041.

It is an arithmetic number, because the mean of its divisors is an integer number (467788321).

Almost surely, 2^1871000641 is an apocalyptic number.

It is an amenable number.

1871000641 is a deficient number, since it is larger than the sum of its proper divisors (152643).

1871000641 is a wasteful number, since it uses less digits than its factorization.

1871000641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152642.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 1871000641 is about 43255.0649173019. The cubic root of 1871000641 is about 1232.2286781846.

The spelling of 1871000641 in words is "one billion, eight hundred seventy-one million, six hundred forty-one", and thus it is an aban number.