1851123345 has 16 divisors (see below), whose sum is σ = 2981415552. Its totient is φ = 980726400.

The previous prime is 1851123343. The next prime is 1851123349. The reversal of 1851123345 is 5433211581.

It is not a de Polignac number, because 1851123345 - 2¹ = 1851123343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1851123343) 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 15 ways as a sum of consecutive naturals, for example, 406372 + ... + 410901.

It is an arithmetic number, because the mean of its divisors is an integer number (186338472).

Almost surely, 2^1851123345 is an apocalyptic number.

1851123345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1851123345 is a deficient number, since it is larger than the sum of its proper divisors (1130292207).

1851123345 is a wasteful number, since it uses less digits than its factorization.

1851123345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817432.

The product of its digits is 14400, while the sum is 33.

The square root of 1851123345 is about 43024.6829738465. The cubic root of 1851123345 is about 1227.8494478947.

The spelling of 1851123345 in words is "one billion, eight hundred fifty-one million, one hundred twenty-three thousand, three hundred forty-five".