891393043511 has 2 divisors, whose sum is σ = 891393043512. Its totient is φ = 891393043510.

The previous prime is 891393043483. The next prime is 891393043531. The reversal of 891393043511 is 115340393198.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 891393043511 - 2⁶ = 891393043447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (891393043531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445696521755 + 445696521756.

It is an arithmetic number, because the mean of its divisors is an integer number (445696521756).

Almost surely, 2^891393043511 is an apocalyptic number.

891393043511 is a deficient number, since it is larger than the sum of its proper divisors (1).

891393043511 is an equidigital number, since it uses as much as digits as its factorization.

891393043511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 47.

The spelling of 891393043511 in words is "eight hundred ninety-one billion, three hundred ninety-three million, forty-three thousand, five hundred eleven".