1943949191 has 2 divisors, whose sum is σ = 1943949192. Its totient is φ = 1943949190.

The previous prime is 1943949157. The next prime is 1943949197. The reversal of 1943949191 is 1919493491.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1943949191 - 2¹⁸ = 1943687047 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1943949197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 971974595 + 971974596.

It is an arithmetic number, because the mean of its divisors is an integer number (971974596).

Almost surely, 2^1943949191 is an apocalyptic number.

1943949191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1943949191 is an equidigital number, since it uses as much as digits as its factorization.

1943949191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 314928, while the sum is 50.

The square root of 1943949191 is about 44090.2391805715. The cubic root of 1943949191 is about 1248.0394205904.

The spelling of 1943949191 in words is "one billion, nine hundred forty-three million, nine hundred forty-nine thousand, one hundred ninety-one".