1851084989 has 16 divisors (see below), whose sum is σ = 2101585920. Its totient is φ = 1618375680.

The previous prime is 1851084973. The next prime is 1851085021. The reversal of 1851084989 is 9894801581.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1851084989 - 2⁴ = 1851084973 is a prime.

It is a super-2 number, since 2×1851084989² = 6853031273002260242, which contains 22 as substring.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1851084989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1851084929) 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, 29924 + ... + 67805.

It is an arithmetic number, because the mean of its divisors is an integer number (131349120).

Almost surely, 2^1851084989 is an apocalyptic number.

It is an amenable number.

1851084989 is a deficient number, since it is larger than the sum of its proper divisors (250500931).

1851084989 is a wasteful number, since it uses less digits than its factorization.

1851084989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97820.

The product of its (nonzero) digits is 829440, while the sum is 53.

The square root of 1851084989 is about 43024.2372274047. The cubic root of 1851084989 is about 1227.8409673291.

The spelling of 1851084989 in words is "one billion, eight hundred fifty-one million, eighty-four thousand, nine hundred eighty-nine".