1999971607 has 2 divisors, whose sum is σ = 1999971608. Its totient is φ = 1999971606.

The previous prime is 1999971593. The next prime is 1999971653. The reversal of 1999971607 is 7061799991.

It is a weak prime.

It is an emirp because it is prime and its reverse (7061799991) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1999971607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1999971007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999985803 + 999985804.

It is an arithmetic number, because the mean of its divisors is an integer number (999985804).

Almost surely, 2^1999971607 is an apocalyptic number.

1999971607 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999971607 is an equidigital number, since it uses as much as digits as its factorization.

1999971607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1928934, while the sum is 58.

The square root of 1999971607 is about 44721.0421054787. The cubic root of 1999971607 is about 1259.9150877103.

The spelling of 1999971607 in words is "one billion, nine hundred ninety-nine million, nine hundred seventy-one thousand, six hundred seven".