891697610913 has 16 divisors (see below), whose sum is σ = 1190994604800. Its totient is φ = 593433734400.

The previous prime is 891697610887. The next prime is 891697610929. The reversal of 891697610913 is 319016796198.

It is a happy number.

It is not a de Polignac number, because 891697610913 - 2¹³ = 891697602721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (891697610413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3945273 + ... + 4165161.

It is an arithmetic number, because the mean of its divisors is an integer number (74437162800).

Almost surely, 2^891697610913 is an apocalyptic number.

It is an amenable number.

891697610913 is a deficient number, since it is larger than the sum of its proper divisors (299296993887).

891697610913 is a wasteful number, since it uses less digits than its factorization.

891697610913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222232.

The product of its (nonzero) digits is 4408992, while the sum is 60.

The spelling of 891697610913 in words is "eight hundred ninety-one billion, six hundred ninety-seven million, six hundred ten thousand, nine hundred thirteen".