1999069949 has 2 divisors, whose sum is σ = 1999069950. Its totient is φ = 1999069948.

The previous prime is 1999069939. The next prime is 1999069951. The reversal of 1999069949 is 9499609991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1998984100 + 85849 = 44710^2 + 293^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1999069949 is a prime.

Together with 1999069951, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1999069939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999534974 + 999534975.

It is an arithmetic number, because the mean of its divisors is an integer number (999534975).

Almost surely, 2^1999069949 is an apocalyptic number.

It is an amenable number.

1999069949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999069949 is an equidigital number, since it uses as much as digits as its factorization.

1999069949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12754584, while the sum is 65.

The square root of 1999069949 is about 44710.9600545549. The cubic root of 1999069949 is about 1259.7257211421.

The spelling of 1999069949 in words is "one billion, nine hundred ninety-nine million, sixty-nine thousand, nine hundred forty-nine".