1891353767879 has 2 divisors, whose sum is σ = 1891353767880. Its totient is φ = 1891353767878.

The previous prime is 1891353767843. The next prime is 1891353767999. The reversal of 1891353767879 is 9787673531981.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1891353767879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1891353767179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 945676883939 + 945676883940.

It is an arithmetic number, because the mean of its divisors is an integer number (945676883940).

Almost surely, 2^{1891353767879} is an apocalyptic number.

1891353767879 is a deficient number, since it is larger than the sum of its proper divisors (1).

1891353767879 is an equidigital number, since it uses as much as digits as its factorization.

1891353767879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 480090240, while the sum is 74.

The spelling of 1891353767879 in words is "one trillion, eight hundred ninety-one billion, three hundred fifty-three million, seven hundred sixty-seven thousand, eight hundred seventy-nine".