1999263779 has 2 divisors, whose sum is σ = 1999263780. Its totient is φ = 1999263778.

The previous prime is 1999263757. The next prime is 1999263787. The reversal of 1999263779 is 9773629991.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1999263779 is a prime.

It is not a weakly prime, because it can be changed into another prime (1999263479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999631889 + 999631890.

It is an arithmetic number, because the mean of its divisors is an integer number (999631890).

Almost surely, 2^1999263779 is an apocalyptic number.

1999263779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999263779 is an equidigital number, since it uses as much as digits as its factorization.

1999263779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11573604, while the sum is 62.

The square root of 1999263779 is about 44713.1275913461. The cubic root of 1999263779 is about 1259.7664341989.

The spelling of 1999263779 in words is "one billion, nine hundred ninety-nine million, two hundred sixty-three thousand, seven hundred seventy-nine".