1871216641 has 8 divisors (see below), whose sum is σ = 2144594304. Its totient is φ = 1599354240.

The previous prime is 1871216629. The next prime is 1871216647. The reversal of 1871216641 is 1466121781.

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 1871216641 - 2⁵ = 1871216609 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1871216641.

It is not an unprimeable number, because it can be changed into a prime (1871216647) 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, 376165 + ... + 381106.

It is an arithmetic number, because the mean of its divisors is an integer number (268074288).

Almost surely, 2^1871216641 is an apocalyptic number.

It is an amenable number.

1871216641 is a deficient number, since it is larger than the sum of its proper divisors (273377663).

1871216641 is an equidigital number, since it uses as much as digits as its factorization.

1871216641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757631.

The product of its digits is 16128, while the sum is 37.

The square root of 1871216641 is about 43257.5616626735. The cubic root of 1871216641 is about 1232.2760950849.

It can be divided in two parts, 18712 and 16641, that added together give a palindrome (35353).

The spelling of 1871216641 in words is "one billion, eight hundred seventy-one million, two hundred sixteen thousand, six hundred forty-one".