1861287107 has 2 divisors, whose sum is σ = 1861287108. Its totient is φ = 1861287106.

The previous prime is 1861287097. The next prime is 1861287137. The reversal of 1861287107 is 7017821681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1861287107 - 2¹⁰ = 1861286083 is a prime.

It is not a weakly prime, because it can be changed into another prime (1861287137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 930643553 + 930643554.

It is an arithmetic number, because the mean of its divisors is an integer number (930643554).

Almost surely, 2^1861287107 is an apocalyptic number.

1861287107 is a deficient number, since it is larger than the sum of its proper divisors (1).

1861287107 is an equidigital number, since it uses as much as digits as its factorization.

1861287107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37632, while the sum is 41.

The square root of 1861287107 is about 43142.6367645743. The cubic root of 1861287107 is about 1230.0925541212.

The spelling of 1861287107 in words is "one billion, eight hundred sixty-one million, two hundred eighty-seven thousand, one hundred seven".