1999101851 has 2 divisors, whose sum is σ = 1999101852. Its totient is φ = 1999101850.

The previous prime is 1999101829. The next prime is 1999101869. The reversal of 1999101851 is 1581019991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1999101851 - 2¹⁸ = 1998839707 is a prime.

It is not a weakly prime, because it can be changed into another prime (1999109851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999550925 + 999550926.

It is an arithmetic number, because the mean of its divisors is an integer number (999550926).

Almost surely, 2^1999101851 is an apocalyptic number.

1999101851 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999101851 is an equidigital number, since it uses as much as digits as its factorization.

1999101851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 44.

The square root of 1999101851 is about 44711.3168112951. The cubic root of 1999101851 is about 1259.7324221842.

The spelling of 1999101851 in words is "one billion, nine hundred ninety-nine million, one hundred one thousand, eight hundred fifty-one".