1861858141 has 16 divisors (see below), whose sum is σ = 2233905408. Its totient is φ = 1529150400.

The previous prime is 1861858121. The next prime is 1861858169. The reversal of 1861858141 is 1418581681.

It is a cyclic number.

It is not a de Polignac number, because 1861858141 - 2¹¹ = 1861856093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861858121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131790 + ... + 145231.

It is an arithmetic number, because the mean of its divisors is an integer number (139619088).

Almost surely, 2^1861858141 is an apocalyptic number.

1861858141 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1861858141 is a deficient number, since it is larger than the sum of its proper divisors (372047267).

1861858141 is a wasteful number, since it uses less digits than its factorization.

1861858141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277092.

The product of its digits is 61440, while the sum is 43.

The square root of 1861858141 is about 43149.2542345751. The cubic root of 1861858141 is about 1230.2183367669.

The spelling of 1861858141 in words is "one billion, eight hundred sixty-one million, eight hundred fifty-eight thousand, one hundred forty-one".