1861473143 has 2 divisors, whose sum is σ = 1861473144. Its totient is φ = 1861473142.

The previous prime is 1861473113. The next prime is 1861473221. The reversal of 1861473143 is 3413741681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1861473143 - 2⁶ = 1861473079 is a prime.

It is a super-2 number, since 2×1861473143² = 6930164524220596898, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1861473097 and 1861473106.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1861473113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 930736571 + 930736572.

It is an arithmetic number, because the mean of its divisors is an integer number (930736572).

Almost surely, 2^1861473143 is an apocalyptic number.

1861473143 is a deficient number, since it is larger than the sum of its proper divisors (1).

1861473143 is an equidigital number, since it uses as much as digits as its factorization.

1861473143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 38.

The square root of 1861473143 is about 43144.7927680734. The cubic root of 1861473143 is about 1230.1335354173.

The spelling of 1861473143 in words is "one billion, eight hundred sixty-one million, four hundred seventy-three thousand, one hundred forty-three".