1851912243 has 6 divisors (see below), whose sum is σ = 2674984364. Its totient is φ = 1234608156.

The previous prime is 1851912239. The next prime is 1851912259. The reversal of 1851912243 is 3422191581.

1851912243 is a `hidden beast` number, since 18 + 519 + 122 + 4 + 3 = 666.

It is not a de Polignac number, because 1851912243 - 2² = 1851912239 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1851912198 and 1851912207.

It is not an unprimeable number, because it can be changed into a prime (1851912043) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 102884005 + ... + 102884022.

Almost surely, 2^1851912243 is an apocalyptic number.

1851912243 is a deficient number, since it is larger than the sum of its proper divisors (823072121).

1851912243 is a wasteful number, since it uses less digits than its factorization.

1851912243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205768033 (or 205768030 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 1851912243 is about 43033.8499672060. The cubic root of 1851912243 is about 1228.0238483752.

The spelling of 1851912243 in words is "one billion, eight hundred fifty-one million, nine hundred twelve thousand, two hundred forty-three".