1861143516 has 18 divisors (see below), whose sum is σ = 4704557312. Its totient is φ = 620381160.

The previous prime is 1861143491. The next prime is 1861143517. The reversal of 1861143516 is 6153411681.

It is a happy number.

1861143516 is a `hidden beast` number, since 1 + 8 + 611 + 4 + 35 + 1 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 51698431 = 1861143516 / (1 + 8 + 6 + 1 + 1 + 4 + 3 + 5 + 1 + 6).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861143517) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25849180 + ... + 25849251.

Almost surely, 2^1861143516 is an apocalyptic number.

It is an amenable number.

1861143516 is an abundant number, since it is smaller than the sum of its proper divisors (2843413796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1861143516 is a wasteful number, since it uses less digits than its factorization.

1861143516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51698441 (or 51698436 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 1861143516 is about 43140.9725898710. The cubic root of 1861143516 is about 1230.0609210357.

The spelling of 1861143516 in words is "one billion, eight hundred sixty-one million, one hundred forty-three thousand, five hundred sixteen".