1861056111 has 8 divisors (see below), whose sum is σ = 2488519600. Its totient is φ = 1237148352.

The previous prime is 1861056097. The next prime is 1861056143. The reversal of 1861056111 is 1116501681.

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

It is not a de Polignac number, because 1861056111 - 2²⁷ = 1726838383 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 (1861056611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 887710 + ... + 889803.

It is an arithmetic number, because the mean of its divisors is an integer number (311064950).

Almost surely, 2^1861056111 is an apocalyptic number.

1861056111 is a deficient number, since it is larger than the sum of its proper divisors (627463489).

1861056111 is a wasteful number, since it uses less digits than its factorization.

1861056111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1777865.

The product of its (nonzero) digits is 1440, while the sum is 30.

The square root of 1861056111 is about 43139.9595618726. The cubic root of 1861056111 is about 1230.0416649248.

Adding to 1861056111 its reverse (1116501681), we get a palindrome (2977557792).

The spelling of 1861056111 in words is "one billion, eight hundred sixty-one million, fifty-six thousand, one hundred eleven".