1861056117 has 12 divisors (see below), whose sum is σ = 2698416864. Its totient is φ = 1235985000.

The previous prime is 1861056097. The next prime is 1861056143. The reversal of 1861056117 is 7116501681.

1861056117 is a `hidden beast` number, since 1 + 86 + 1 + 0 + 561 + 17 = 666.

It is not a de Polignac number, because 1861056117 - 2⁶ = 1861056053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861056157) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 390759 + ... + 395492.

It is an arithmetic number, because the mean of its divisors is an integer number (224868072).

Almost surely, 2^1861056117 is an apocalyptic number.

It is an amenable number.

1861056117 is a deficient number, since it is larger than the sum of its proper divisors (837360747).

1861056117 is a wasteful number, since it uses less digits than its factorization.

1861056117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 786520 (or 786517 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 36.

The square root of 1861056117 is about 43139.9596314137. The cubic root of 1861056117 is about 1230.0416662467.

Adding to 1861056117 its reverse (7116501681), we get a palindrome (8977557798).

The spelling of 1861056117 in words is "one billion, eight hundred sixty-one million, fifty-six thousand, one hundred seventeen".