1949819057 has 2 divisors, whose sum is σ = 1949819058. Its totient is φ = 1949819056.

The previous prime is 1949819023. The next prime is 1949819071. The reversal of 1949819057 is 7509189491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1405950016 + 543869041 = 37496^2 + 23321^2 .

It is an emirp because it is prime and its reverse (7509189491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1949819057 - 2⁶ = 1949818993 is a prime.

It is not a weakly prime, because it can be changed into another prime (1949819077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 974909528 + 974909529.

It is an arithmetic number, because the mean of its divisors is an integer number (974909529).

Almost surely, 2^1949819057 is an apocalyptic number.

It is an amenable number.

1949819057 is a deficient number, since it is larger than the sum of its proper divisors (1).

1949819057 is an equidigital number, since it uses as much as digits as its factorization.

1949819057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 816480, while the sum is 53.

The square root of 1949819057 is about 44156.7555080760. The cubic root of 1949819057 is about 1249.2943338632.

The spelling of 1949819057 in words is "one billion, nine hundred forty-nine million, eight hundred nineteen thousand, fifty-seven".