1959005891 has 2 divisors, whose sum is σ = 1959005892. Its totient is φ = 1959005890.

The previous prime is 1959005869. The next prime is 1959005921. The reversal of 1959005891 is 1985009591.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1959005891 - 2³⁰ = 885264067 is a prime.

It is not a weakly prime, because it can be changed into another prime (1959005491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 979502945 + 979502946.

It is an arithmetic number, because the mean of its divisors is an integer number (979502946).

Almost surely, 2^1959005891 is an apocalyptic number.

1959005891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1959005891 is an equidigital number, since it uses as much as digits as its factorization.

1959005891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145800, while the sum is 47.

The square root of 1959005891 is about 44260.6585016536. The cubic root of 1959005891 is about 1251.2533329851.

The spelling of 1959005891 in words is "one billion, nine hundred fifty-nine million, five thousand, eight hundred ninety-one".