891931225681 has 8 divisors (see below), whose sum is σ = 897432197760. Its totient is φ = 886432159488.

The previous prime is 891931225637. The next prime is 891931225733. The reversal of 891931225681 is 186522139198.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 891931225681 - 2¹¹ = 891931223633 is a prime.

It is a super-2 number, since 2×891931225681² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (891931225621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 468145 + ... + 1415281.

It is an arithmetic number, because the mean of its divisors is an integer number (112179024720).

Almost surely, 2^891931225681 is an apocalyptic number.

It is an amenable number.

891931225681 is a deficient number, since it is larger than the sum of its proper divisors (5500972079).

891931225681 is a wasteful number, since it uses less digits than its factorization.

891931225681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952943.

The product of its digits is 1866240, while the sum is 55.

The spelling of 891931225681 in words is "eight hundred ninety-one billion, nine hundred thirty-one million, two hundred twenty-five thousand, six hundred eighty-one".