9891432341989 has 16 divisors (see below), whose sum is σ = 10842875656704. Its totient is φ = 8948721254400.

The previous prime is 9891432341899. The next prime is 9891432342007.

9891432341989 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 9891432341989 - 2³³ = 9882842407397 is a prime.

It is a super-2 number, since 2×9891432341989² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9891432347989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6237669 + ... + 7661029.

It is an arithmetic number, because the mean of its divisors is an integer number (677679728544).

Almost surely, 2^{9891432341989} is an apocalyptic number.

It is an amenable number.

9891432341989 is a deficient number, since it is larger than the sum of its proper divisors (951443314715).

9891432341989 is a wasteful number, since it uses less digits than its factorization.

9891432341989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1426428.

The product of its digits is 120932352, while the sum is 70.

The spelling of 9891432341989 in words is "nine trillion, eight hundred ninety-one billion, four hundred thirty-two million, three hundred forty-one thousand, nine hundred eighty-nine".