1949999999 has 2 divisors, whose sum is σ = 1950000000. Its totient is φ = 1949999998.

The previous prime is 1949999983. The next prime is 1950000023. The reversal of 1949999999 is 9999999491.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (9999999491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1949999999 - 2⁴ = 1949999983 is a prime.

It is a super-2 number, since 2×1949999999² = 7604999992200000002, which contains 22 as substring.

1949999999 is a modest number, since divided by 99999 gives 19499 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1949999929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 974999999 + 975000000.

It is an arithmetic number, because the mean of its divisors is an integer number (975000000).

Almost surely, 2^1949999999 is an apocalyptic number.

1949999999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1949999999 is an equidigital number, since it uses as much as digits as its factorization.

1949999999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172186884, while the sum is 77.

The square root of 1949999999 is about 44158.8043203165. The cubic root of 1949999999 is about 1249.3329772478.

The spelling of 1949999999 in words is "one billion, nine hundred forty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".