1959197791 has 2 divisors, whose sum is σ = 1959197792. Its totient is φ = 1959197790.

The previous prime is 1959197743. The next prime is 1959197797. The reversal of 1959197791 is 1977919591.

It is a strong prime.

It is an emirp because it is prime and its reverse (1977919591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1959197791 - 2¹⁹ = 1958673503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1959197797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 979598895 + 979598896.

It is an arithmetic number, because the mean of its divisors is an integer number (979598896).

Almost surely, 2^1959197791 is an apocalyptic number.

1959197791 is a deficient number, since it is larger than the sum of its proper divisors (1).

1959197791 is an equidigital number, since it uses as much as digits as its factorization.

1959197791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1607445, while the sum is 58.

The square root of 1959197791 is about 44262.8262879812. The cubic root of 1959197791 is about 1251.2941883455.

The spelling of 1959197791 in words is "one billion, nine hundred fifty-nine million, one hundred ninety-seven thousand, seven hundred ninety-one".