1861142471 has 2 divisors, whose sum is σ = 1861142472. Its totient is φ = 1861142470.

The previous prime is 1861142429. The next prime is 1861142501. The reversal of 1861142471 is 1742411681.

It is a strong prime.

It is an emirp because it is prime and its reverse (1742411681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1861142471 - 2¹⁴ = 1861126087 is a prime.

It is a super-3 number, since 3×1861142471³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1861112471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 930571235 + 930571236.

It is an arithmetic number, because the mean of its divisors is an integer number (930571236).

Almost surely, 2^1861142471 is an apocalyptic number.

1861142471 is a deficient number, since it is larger than the sum of its proper divisors (1).

1861142471 is an equidigital number, since it uses as much as digits as its factorization.

1861142471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 35.

The square root of 1861142471 is about 43140.9604784131. The cubic root of 1861142471 is about 1230.0606908163.

The spelling of 1861142471 in words is "one billion, eight hundred sixty-one million, one hundred forty-two thousand, four hundred seventy-one".