1943949149 has 2 divisors, whose sum is σ = 1943949150. Its totient is φ = 1943949148.

The previous prime is 1943949131. The next prime is 1943949157. The reversal of 1943949149 is 9419493491.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1728064900 + 215884249 = 41570^2 + 14693^2 .

It is a cyclic number.

It is not a de Polignac number, because 1943949149 - 2²⁴ = 1927171933 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1943949149.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1943949349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 971974574 + 971974575.

It is an arithmetic number, because the mean of its divisors is an integer number (971974575).

Almost surely, 2^1943949149 is an apocalyptic number.

It is an amenable number.

1943949149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1943949149 is an equidigital number, since it uses as much as digits as its factorization.

1943949149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1259712, while the sum is 53.

The square root of 1943949149 is about 44090.2387042756. The cubic root of 1943949149 is about 1248.0394116023.

The spelling of 1943949149 in words is "one billion, nine hundred forty-three million, nine hundred forty-nine thousand, one hundred forty-nine".