1986199601 has 2 divisors, whose sum is σ = 1986199602. Its totient is φ = 1986199600.

The previous prime is 1986199597. The next prime is 1986199603. The reversal of 1986199601 is 1069916891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1807950400 + 178249201 = 42520^2 + 13351^2 .

It is an emirp because it is prime and its reverse (1069916891) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1096619861 and 1689166901.

It is a cyclic number.

It is not a de Polignac number, because 1986199601 - 2² = 1986199597 is a prime.

It is a Sophie Germain prime.

Together with 1986199603, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1986199601.

It is not a weakly prime, because it can be changed into another prime (1986199603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 993099800 + 993099801.

It is an arithmetic number, because the mean of its divisors is an integer number (993099801).

Almost surely, 2^1986199601 is an apocalyptic number.

It is an amenable number.

1986199601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1986199601 is an equidigital number, since it uses as much as digits as its factorization.

1986199601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 209952, while the sum is 50.

The square root of 1986199601 is about 44566.7993129415. The cubic root of 1986199601 is about 1257.0164566581.

The spelling of 1986199601 in words is "one billion, nine hundred eighty-six million, one hundred ninety-nine thousand, six hundred one".