1861936199 has 2 divisors, whose sum is σ = 1861936200. Its totient is φ = 1861936198.

The previous prime is 1861936177. The next prime is 1861936207. The reversal of 1861936199 is 9916391681.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1861936199 - 2¹² = 1861932103 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1861936199.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1861936129) 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, 930968099 + 930968100.

It is an arithmetic number, because the mean of its divisors is an integer number (930968100).

Almost surely, 2^1861936199 is an apocalyptic number.

1861936199 is a deficient number, since it is larger than the sum of its proper divisors (1).

1861936199 is an equidigital number, since it uses as much as digits as its factorization.

1861936199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 629856, while the sum is 53.

The square root of 1861936199 is about 43150.1587366721. The cubic root of 1861936199 is about 1230.2355287392.

The spelling of 1861936199 in words is "one billion, eight hundred sixty-one million, nine hundred thirty-six thousand, one hundred ninety-nine".