1849868991 has 24 divisors (see below), whose sum is σ = 2835456624. Its totient is φ = 1158140160.

The previous prime is 1849868971. The next prime is 1849869011. The reversal of 1849868991 is 1998689481.

It is an interprime number because it is at equal distance from previous prime (1849868971) and next prime (1849869011).

It is not a de Polignac number, because 1849868991 - 2⁶ = 1849868927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1849868971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57420 + ... + 83646.

It is an arithmetic number, because the mean of its divisors is an integer number (118144026).

Almost surely, 2^1849868991 is an apocalyptic number.

1849868991 is a deficient number, since it is larger than the sum of its proper divisors (985587633).

1849868991 is a wasteful number, since it uses less digits than its factorization.

1849868991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26711 (or 26708 counting only the distinct ones).

The product of its digits is 8957952, while the sum is 63.

The square root of 1849868991 is about 43010.1033595596. The cubic root of 1849868991 is about 1227.5720477094.

The spelling of 1849868991 in words is "one billion, eight hundred forty-nine million, eight hundred sixty-eight thousand, nine hundred ninety-one".