1813871516 has 12 divisors (see below), whose sum is σ = 3176805240. Its totient is φ = 906212880.

The previous prime is 1813871453. The next prime is 1813871533. The reversal of 1813871516 is 6151783181.

It is a super-2 number, since 2×1813871516² = 6580259753112276512, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175055 + ... + 185126.

It is an arithmetic number, because the mean of its divisors is an integer number (264733770).

Almost surely, 2^1813871516 is an apocalyptic number.

It is an amenable number.

1813871516 is a deficient number, since it is larger than the sum of its proper divisors (1362933724).

1813871516 is a wasteful number, since it uses less digits than its factorization.

1813871516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361444 (or 361442 counting only the distinct ones).

The product of its digits is 40320, while the sum is 41.

The square root of 1813871516 is about 42589.5705073437. The cubic root of 1813871516 is about 1219.5571975401.

The spelling of 1813871516 in words is "one billion, eight hundred thirteen million, eight hundred seventy-one thousand, five hundred sixteen".