1999769149 has 4 divisors (see below), whose sum is σ = 2285450464. Its totient is φ = 1714087836.

The previous prime is 1999769119. The next prime is 1999769159. The reversal of 1999769149 is 9419679991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1999769149 - 2¹¹ = 1999767101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999769119) 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 in 3 ways as a sum of consecutive naturals, for example, 142840647 + ... + 142840660.

It is an arithmetic number, because the mean of its divisors is an integer number (571362616).

Almost surely, 2^1999769149 is an apocalyptic number.

It is an amenable number.

1999769149 is a deficient number, since it is larger than the sum of its proper divisors (285681315).

1999769149 is an equidigital number, since it uses as much as digits as its factorization.

1999769149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285681314.

The product of its digits is 9920232, while the sum is 64.

The square root of 1999769149 is about 44718.7784828700. The cubic root of 1999769149 is about 1259.8725723573.

The spelling of 1999769149 in words is "one billion, nine hundred ninety-nine million, seven hundred sixty-nine thousand, one hundred forty-nine".