1871216541 has 12 divisors (see below), whose sum is σ = 2747178460. Its totient is φ = 1227026880.

The previous prime is 1871216533. The next prime is 1871216549. The reversal of 1871216541 is 1456121781.

It is an interprime number because it is at equal distance from previous prime (1871216533) and next prime (1871216549).

It can be written as a sum of positive squares in 2 ways, for example, as 52620516 + 1818596025 = 7254^2 + 42645^2 .

It is not a de Polignac number, because 1871216541 - 2³ = 1871216533 is a prime.

It is a super-3 number, since 3×1871216541³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1871216496 and 1871216505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1871216549) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1703656 + ... + 1704753.

Almost surely, 2^1871216541 is an apocalyptic number.

It is an amenable number.

1871216541 is a deficient number, since it is larger than the sum of its proper divisors (875961919).

1871216541 is a wasteful number, since it uses less digits than its factorization.

1871216541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3408476 (or 3408473 counting only the distinct ones).

The product of its digits is 13440, while the sum is 36.

The square root of 1871216541 is about 43257.5605068062. The cubic root of 1871216541 is about 1232.2760731335.

It can be divided in two parts, 18712 and 16541, that added together give a palindrome (35253).

The spelling of 1871216541 in words is "one billion, eight hundred seventy-one million, two hundred sixteen thousand, five hundred forty-one".