1861143011 has 16 divisors (see below), whose sum is σ = 2295701184. Its totient is φ = 1469297664.

The previous prime is 1861143007. The next prime is 1861143041. The reversal of 1861143011 is 1103411681.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1861143011 - 2² = 1861143007 is a prime.

It is a super-2 number, since 2×1861143011² = 6927706614788292242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1861143041) 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, 19211 + ... + 63963.

It is an arithmetic number, because the mean of its divisors is an integer number (143481324).

Almost surely, 2^1861143011 is an apocalyptic number.

1861143011 is a deficient number, since it is larger than the sum of its proper divisors (434558173).

1861143011 is a wasteful number, since it uses less digits than its factorization.

1861143011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45230.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 1861143011 is about 43140.9667369659. The cubic root of 1861143011 is about 1230.0608097814.

Adding to 1861143011 its reverse (1103411681), we get a palindrome (2964554692).

The spelling of 1861143011 in words is "one billion, eight hundred sixty-one million, one hundred forty-three thousand, eleven".