1851291842 has 8 divisors (see below), whose sum is σ = 2777926476. Its totient is φ = 925316352.

The previous prime is 1851291839. The next prime is 1851291853. The reversal of 1851291842 is 2481921581.

It can be written as a sum of positive squares in 2 ways, for example, as 1774010161 + 77281681 = 42119^2 + 8791^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1851291842.

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, 157703 + ... + 169034.

Almost surely, 2^1851291842 is an apocalyptic number.

1851291842 is a deficient number, since it is larger than the sum of its proper divisors (926634634).

1851291842 is a wasteful number, since it uses less digits than its factorization.

1851291842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329572.

The product of its digits is 46080, while the sum is 41.

The square root of 1851291842 is about 43026.6410727121. The cubic root of 1851291842 is about 1227.8867014309.

The spelling of 1851291842 in words is "one billion, eight hundred fifty-one million, two hundred ninety-one thousand, eight hundred forty-two".