891235661143 has 4 divisors (see below), whose sum is σ = 892313335080. Its totient is φ = 890157987208.

The previous prime is 891235661101. The next prime is 891235661201. The reversal of 891235661143 is 341166532198.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 891235661143 - 2¹⁷ = 891235530071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891235661543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 538835728 + ... + 538837381.

It is an arithmetic number, because the mean of its divisors is an integer number (223078333770).

Almost surely, 2^891235661143 is an apocalyptic number.

891235661143 is a deficient number, since it is larger than the sum of its proper divisors (1077673937).

891235661143 is a wasteful number, since it uses less digits than its factorization.

891235661143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077673936.

The product of its digits is 933120, while the sum is 49.

The spelling of 891235661143 in words is "eight hundred ninety-one billion, two hundred thirty-five million, six hundred sixty-one thousand, one hundred forty-three".